Investments, Debt and Equity Securities [Abstract] Securities available for sale: Available-for-sale Securities, Debt Maturities [Abstract] Amortized cost, securities available for sale Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract] Due in one year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis Due in 1-5 years Available for Sale Securities Debt Maturities Rolling Year One Through Five Amortized Cost Basis Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the first rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. Due in 5-10 years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis Due after 10 years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Fair value, securities available for sale Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] Due in one year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Due in 1-5 years Available for Sale Securities Debt Maturities Rolling Year One Through Five Fair Value Amount of available-for-sale debt securities at fair value maturing in the first rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Due in 5-10 years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Due after 10 years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value Fair Value Available-for-sale Securities Securities held to maturity: Held-to-maturity Securities, Debt Maturities [Abstract] Amortized cost, securities held to maturity Held to Maturity Securities Debt Maturities Net Carrying Amount Rolling Maturity [Abstract] Due in one year or less Held to Maturity Securities Debt Maturities Next Rolling Twelve Months Net Carrying Amount Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next rolling twelve months following the latest balance sheet presented. Due in 1-5 years Held to Maturity Securities Debt Maturities Rolling Year One Through Five Years Net Carrying Amount Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Due in 5-10 years Held-to-maturity Securities, Debt Maturities, Rolling Year Five Through Ten Years, Net Carrying Amount Held-to-maturity Securities, Debt Maturities, Rolling Year Five Through Ten Years, Net Carrying Amount Due after 10 years Held to Maturity Securities Debt Maturities Rolling after Ten Years Net Carrying Amount Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing after the tenth rolling twelve months following the latest balance sheet presented. Amortized Cost Held-to-maturity Securities Fair value, securities held to maturity Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] Due in one year or less Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Due in 1-5 years Held To Maturity Securities, Debt Maturities, Rolling Year One Through Five, Fair Value Amount of held-to-maturity debt securities at fair value maturing in the rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Due in 5-10 years Held-to-maturity Securities, Debt Maturities, Rolling Year Five Through Ten, Fair Value Held-to-maturity Securities, Debt Maturities, Rolling Year Five Through Ten, Fair Value Due after 10 Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Fair Value Fair Value Held-to-maturity Securities, Fair Value Earnings Per Share [Abstract] Computation of basic and diluted earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Receivables [Abstract] Loans and Leases Financing Receivables [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Summary of derivative instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of pre-tax impact of derivative activity Schedule of Derivative Activity Statement of Income [Table Text Block] Tabular disclosure of the presentation of derivative activity on the statement of income, including the location of such amounts. Regulatory Capital Requirements [Abstract] Schedule of regulatory capital information for TCF and TCF Bank Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Income Statement [Abstract] Interest income: Interest and Dividend Income, Operating [Abstract] Loans and leases Interest and Fee Income, Loans and Leases Securities available for sale Interest and Dividend Income, Securities, Operating, Available-for-sale Securities held to maturity Interest Income, Securities, Operating, Held-to-maturity Investments and other Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating Interest expense: Interest Expense [Abstract] Deposits Interest Expense, Deposits Borrowings Interest Expense, Borrowings Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provision for credit losses Provision for Loan and Lease Losses Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Non-interest income: Noninterest Income [Abstract] Fees and service charges Fees and Commissions, Depositor Accounts Card revenue Fees and Commissions, Debit Cards ATM revenue Fees and Commissions ATM Revenue Income earned from transactions and services related to ATM cards. Subtotal Fees and Commissions Gains on sales of auto loans, net Gain (Loss) on Sales of Loans, Net Gains on sales of consumer real estate loans, net Gain (Loss) on Sales of Consumer Loans Servicing fee income Bank Servicing Fees Subtotal Gain (Loss) on Disposition of Assets for Financial Service Operations, Including Bank Servicing Fees Gain (Loss) on Disposition of Assets for Financial Service Operations, Including Bank Servicing Fees Leasing and equipment finance Leases and Equipment Finance Income The total amount of revenue recognized for the period from operating, sales-type, financing and other leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. Other Noninterest Income, Other Operating Income Fees and other revenue Fees and Other Revenue Aggregate of fees and other revenue excluding gain (loss) on sale of securities. Gains (losses) on securities, net Gain (Loss) on Sale of Securities Including Other than Temporary Impairment, Net The net gain or loss realized from the sale, exchange, redemption, retirement and other than temporary impairment charges of securities. Total non-interest income Noninterest Income Non-interest expense: Noninterest Expense [Abstract] Compensation and employee benefits Labor and Related Expense Occupancy and equipment Occupancy, Net FDIC insurance Federal Deposit Insurance Corporation Premium Expense Advertising and marketing Marketing and Advertising Expense Other Other Noninterest Expense Subtotal Noninterest Expense Excluding Other Expenses Total aggregate amount of all noninterest expense excluding operating lease depreciation, foreclosed real estate and repossessed assets, net expense and other credit costs, net. Operating lease depreciation Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease Foreclosed real estate and repossessed assets, net Foreclosed Real Estate and Repossessed Assets Expense Amount of expense recognized during the period for the foreclosure on real estate assets and repossessed equipment. Other credit costs, net Other Credit Costs, Net Amount of consumer real estate loan pool insurance, write-downs on residual values of operating leases and reserve requirements for expected losses on unfunded commitments. Total non-interest expense Noninterest Expense Income before income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Income after income tax expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Income attributable to non-controlling interest Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Nonredeemable Net income attributable to TCF Financial Corporation Net Income (Loss) Attributable to Parent Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Net income per common share: Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Investment Holdings [Table] Investment Holdings [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] U.S. Government sponsored enterprises and federal agencies Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Obligations of states and political subdivisions US States and Political Subdivisions Debt Securities [Member] Securities available for sale and securities held to maturity Investment Holdings [Line Items] Gross unrealized losses and fair value of securities available for sale that is in a loss position Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Less than 12 months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or more, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or more, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Total, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Gross unrealized losses and fair value of securities held to maturity that is in a loss position Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] Less than 12 months, Fair Value Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months, Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or more, Fair Value Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or more, Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total, fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value Total, Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Estimated Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial instrument assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Investments Investments, Fair Value Disclosure Securities held to maturity Loans and leases held for sale Loans Held-for-sale, Fair Value Disclosure Loans: Loans and Leases Receivable, Gross, Commercial [Abstract] Consumer real estate Loans and Leases Receivable, Consumer, Net of Deferred Income Commercial real estate Loans Receivable, Gross, Commercial, Real Estate Commercial business Loans Receivable, Commercial Business, Fair Value Disclosure Represents the fair value of unpaid commercial loans secured by business assets other than real estate, including inventory, receivables, equipment and financial instruments. Equipment finance Loans Receivable, Equipment Financing, Fair Value Disclosure Represents the fair value of commercial loans, which are issued for equipment financing. Inventory finance Loans Receivable, Inventory Financing Net of Deferred Income Fair Value Disclosure Represents the fair value of unpaid commercial variable rate loans which are secured by the underlying floor planned equipment and supported by repurchase agreements from original equipment manufacturers. Auto finance Loans Receivable Auto Finance, Fair Value Disclosure Represents the fair value of loans and leases receivables related to auto finance. Other Loans Receivable, Fair Value Disclosure Allowance for loan losses Loans and Leases Receivable, Allowance Interest-only strips Interest Only Strips, Fair Value Disclosure Represents the total fair market value of interest-only strips. Total financial instrument assets Financial Instrument, Assets, Fair Value Disclosure Represents the fair value of various categories of unpaid commercial loans and other financial instruments. Financial instrument liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Deposits Demand Deposits, Fair Value Disclosure Represents the fair value of accounts that may or may not bear interest and that the depositor is entitled to withdraw at anytime without prior notice. Checking, savings and negotiable order of withdrawal (NOW) accounts are the most common forms of demand deposits. Long-term borrowings Long-term Debt, Fair Value Total financial instrument liabilities Financial Instrument, Liabilities, Fair Value Disclosure Represents the fair value of financial instruments which are a part of liabilities. Financial instruments with off-balance sheet risk: Financial Instruments with Off Balance Sheet Risk [Abstract] Commitments to extend credit Fair Value Disclosure, Off Balance Sheet Risks, Amount Commitments to Extend Credit Represents the fair value of commitments to extend credit, which are not recognized in financial statements (off-balance sheet). Fair Value Disclosure, Off Balance Sheet Risks, Amount Letters of Credit Outstanding Fair Value Disclosure, Off Balance Sheet Risks, Amount Letters of Credit Outstanding Fair Value Disclosure, Off Balance Sheet Risks, Amount Letters of Credit Outstanding Total financial instruments with off-balance sheet risk Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset Statement of Financial Position [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (shares) Preferred Stock, Shares Issued Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, shares issued (shares) Common Stock, Shares, Issued Treasury stock at cost, shares (shares) Treasury Stock, Shares Debt Disclosure [Abstract] Long-term Borrowings Long-term Debt [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Restricted Stock and Stock Option Transactions under the Company Financial Incentive Stock Program Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] TCF Parent Company [Member] TCF Bank Subsidiaries [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum Maximum [Member] Compliance with Regulatory Capital Requirements under Banking Regulations Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Capital conservation buffer capital conservation buffer capital conservation buffer Percentage of net retained profits for the current year combined with retained net profits for the preceding two calendar years that can be declared as dividend Percentage of Net Retained Profits for Current Year Combined with Retained Net Profits for Preceding Two Calendar Years that Can be Declared as Dividend Represents the percentage of net retained profits for the current year combined with retained net profits for the preceding two calendar years that can be declared as dividend. Number of prior calendar years considered for payment of dividends in excess of net retained profit Number of Prior Calendar Years, Considered for Payment of Dividends, Requiring Prior Approval of OCC Represents the number of prior calendar years considered for payment of dividends in excess of net retained profits, for which prior approval from the OCC is required. Net profits for the current year combined with retained net profits for preceding two calendar years Net Retained Profits for Current Year Combined with Retained Net Profits for Preceding Two Calendar Years Represents the net retained profits for the current year combined with retained net profits for preceding two calendar years. Regulatory Capital: Regulatory Capital [Abstract] Regulatory Capital [Abstract] Common equity Tier 1 capital Tier One Common Equity Tier One Common Equity Tier 1 capital Tier One Risk Based Capital Total capital Risk Based Capital This element represents total risk based capital as defined in the regulations. Common equity Tier 1 capital ratio Common Equity Ratios [Abstract] Common Equity Ratios [Abstract] Actual, Ratio Tier One Common Capital to Risk Weighted Assets Tier One Common Capital to Risk Weighted Assets Well-Capitalized Capital Requirement, Ratio Tier One Common Capital Required to be Well Capitalized to Risk Weighted Assets Tier One Common Capital Required to be Well Capitalized to Risk Weighted Assets Minimum Capital Requirement, Ratio Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets Tier One Common Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 risk-based capital ratio Risk Based Ratios [Abstract] Actual, Ratio Tier One Risk Based Capital to Risk Weighted Assets Well-Capitalized Capital Requirement, Ratio Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Minimum Capital Requirement, Ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Total risk-based capital ratio Total Risk Based Ratios [Abstract] Actual, Ratio Capital to Risk Weighted Assets Well-Capitalized Capital Requirement, Ratio Capital Required to be Well Capitalized to Risk Weighted Assets Minimum Capital Requirement, Ratio Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 leverage ratio Leverage Ratios [Abstract] Actual, Ratio Tier One Leverage Capital to Average Assets Well-Capitalized Capital Requirement, Ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Minimum Capital Requirement, Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Deposits [Abstract] Deposits Deposit Liabilities Disclosures [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate contracts Interest Rate Contract [Member] Interest Rate Swap Interest Rate Swap [Member] Interest rate lock commitments Interest Rate Lock Commitments [Member] Other Contract Other Contract [Member] Forward foreign exchange contracts Foreign Exchange Contract [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedges Not Designated as Hedging Instrument [Member] Designated as Hedges Designated as Hedging Instrument [Member] Minimum Minimum [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Net Investment Hedges Net Investment Hedging [Member] Fair value of derivatives Derivatives, Fair Value [Line Items] Period for settling forward foreign exchange contracts Maximum Remaining Maturity of Foreign Currency Derivatives Derivative asset, notional amount Derivative Asset, Notional Amount Derivative, fixed interest rate Derivative, Fixed Interest Rate Period of contracts having fixed maturity dates Derivative, Term of Contract Derivative, higher remaining maturity range Derivative, Higher Remaining Maturity Range Amount of cash collateral posted (received) Collateral Already Posted, Aggregate Fair Value Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Fair Value Disclosures Fair Value Disclosures [Text Block] Summary of deposits Schedule of Deposit Liabilities [Table Text Block] Tabular disclosure of deposit liabilities, including non-interest bearing and interest bearing checking, savings, money market and certificates of deposit. Schedule of certificates of deposit remaining maturities Schedule of Maturities of Certificates of Deposit [Table Text Block] Tabular disclosure of maturities of certificates of deposits. New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Adjustments for New Accounting Pronouncement [Member] Adjustments for New Accounting Pronouncement [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Long-term Debt [Member] Long-term Debt [Member] Other Assets [Member] Other Assets [Member] New Accounting Pronouncements or Change in Accounting Principle New Accounting Pronouncements or Change in Accounting Principle [Line Items] Reclassification of unamortized debt issuance costs Unamortized Debt Issuance Expense Information about loans and leases Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Loan sales transaction table Loan sales transaction table [Table Text Block] Loan sales transaction table [Table Text Block] Interest only strips and contractual liabilites Interest only strips and contractual liabilities [Table Text Block] Interest only strips and contractual liabilities [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Litigation contingencies Loss Contingencies [Line Items] Allowance for Loan and Lease Losses and Credit Quality Information Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Consumer Real Estate Loan Real Estate Loan [Member] Class of Financing Receivable, Type of Borrower [Axis] Class of Financing Receivable, Type of Borrower [Axis] Class of Financing Receivable, Type of Borrower [Domain] Class of Financing Receivable, Type of Borrower [Domain] Consumer Borrower Consumer Borrower [Member] Commercial Borrower Commercial Borrower [Member] Mortgage Loans on Real Estate, Description, Loan Category [Axis] Mortgage Loans on Real Estate, Description, Loan Category [Axis] Mortgage Loans on Real Estate, Loan Category [Domain] Mortgage Loans on Real Estate, Loan Category [Domain] Junior lien Second Mortgage [Member] First mortgage lien First Mortgage [Member] Loan Modifications for Borrowers with Financial Difficulties Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications, Recorded Investment Financing Receivable, Modifications, Recorded Investment Total Accruing TDR Loans Accruing Troubled Debt Restructurings The amount of the outstanding recorded investment related to accruing financing receivables that have been modified by troubled debt restructurings. Unfunded commitments to consumer real estate and commercial loans classified as TDRs Loans and Leases Receivable, Impaired, Commitment to Lend Loans Removed from Troubled Debt Restructurings Status Loans Removed from Troubled Debt Restructurings Status Loans Removed from Troubled Debt Restructurings Status Foregone Interest Income Loans and Leases Receivable Impaired Interest Lost on Troubled Debt Reflects the amount of additional interest income that would have been recorded if troubled debt restructurings were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). Average yield on TDR loans (as a percent) Loans and Leases Receivable Average Yield Percentage Represents the percentage of average yield on troubled debt restructuring loans. Contractual average rate of TDR loans (as a percent) Loans and Leases Receivable Contractual Average Rate Represents the contractual average rate of troubled debt restructuring loans. Reserves for losses on accruing loan TDRs Financing Receivable, Modifications, Allowance for Credit Losses Represent reserves for losses on loan TDRs outstanding as of the balance sheet date. Reserves for losses on accruing loan TDRs (as a percent) Financing Receivable, Modifications, Allowance for Credit Losses as Percentage of Outstanding Balances Represent allowance for losses on loan TDRs as a percentage of loan TDRs outstanding as of the balance sheet date. Assumed remaining re-default rate used in determining impairment, low end of range (as a percent) Financing Receivable, Modifications, Impaired Financing Receivable, Redefault Rate, Low End of Range The low end of the range of rates used in determining the impairment on consumer real estate loan TDRs on mortgages that have already been modified due to borrower hardship. Financing Receivable, Modifications, Impaired Financing Receivable, Redefault Rate, High End of Range Financing Receivable, Modifications, Impaired Financing Receivable, Redefault Rate, High End of Range The high end of the range of rates used in determining the impairment on consumer real estate loan TDRs on mortgages that have already been modified due to borrower hardship. Percent of accruing TDR loans more than 60 days delinquent Financing Receivable, Modifications, Percentage Of Accruing TDR Loans Over 60 Day Delinquencies Represents the percentage of accruing TDR loans over 60 day delinquencies. Delinquency period of performing loans and leases Delinquency Period of Performing Loans and Leases Represents the delinquency period of performing loans and leases. Minimum period to be considered for related third-party first mortgage liens to be past due before Junior lien loans are placed on non-accrual status Minimum Past Due of Interest and Principal for Third Party Consumer First Mortgage Lien to be Placed on Nonaccrual Status Represents the minimum period to be considered for related third-party first mortgage liens to be past due before Junior lien loans are placed on non-accrual status. Portion of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed Financing Receivable Modifications Nonaccruing Troubled Debt Restructurings Chapter 7 Bankruptcy not Reaffirmed Portion of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed. Portion of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed (as a percent) Financing Receivable Modifications Nonaccruing Troubled Debt Restructurings Chapter 7 Bankruptcy not Reaffirmed as Percentage of non Accrual Troubled Debt Restructurings Balance Represents the percentage of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed. Portion of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed, current (as a percent) Financing Receivable Modifications Nonaccruing Troubled Debt Restructurings Chapter 7 Bankruptcy not Reaffirmed as Percentage of non Accrual Troubled Debt Restructurings Balance Current Represents the percentage of non-accrual TDR balance, loans discharged in Chapter 7 bankruptcy that are not reaffirmed that are current. Allowance for Loan and Lease Losses and Credit Quality Information Allowance for Loan Lease Losses and Credit Quality Information Disclosure [Text Block] Represents entire disclosure for allowance for categories of Loan and Lease Losses and Credit Quality Information. Cash and Cash Equivalents [Abstract] Reserve in cash on hand or at the Federal Reserve as required by Federal Reserve regulations Cash Segregated under Other Regulations Total restricted cash balance Restricted Cash and Cash Equivalents Cash held in interest-bearing accounts Interest-bearing Deposits in Banks and Other Financial Institutions Offsetting Assets and Liabilities [Table] Offsetting Assets and Liabilities [Table] Disclosure of information about derivative and financial assets and derivative and financial liabilities that are subject to offsetting, including enforceable master netting arrangements. Other contracts Amounts relevant to offsetting of derivative assets and liabilities Offsetting Assets and Liabilities [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Derivative assets Offsetting Derivative Assets [Abstract] Notional Amount Gross Amounts Recognized Derivative Asset, Fair Value, Gross Asset Gross Amounts Offset Derivative Asset, Fair Value, Gross Liability Net Amount Presented Derivative Asset Derivative liabilities Offsetting Derivative Liabilities [Abstract] Notional Amount Derivative Liability, Notional Amount Gross Amounts Recognized Derivative Liability, Fair Value, Gross Liability Gross Amounts Offset Derivative Liability, Fair Value, Gross Asset Net Amount Presented Derivative Liability Stock Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Litigation Contingencies Legal Matters and Contingencies [Text Block] Cash and Due from Banks Cash and Cash Equivalents Disclosure [Text Block] Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Measurement of fair value on a recurring basis Fair Value, Measurements, Recurring [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Available-for-sale Securities Available-for-sale Securities [Member] Loans and leases held for sale Loans And Leases Held-For-Sale [Member] Loans And Leases Held-For-Sale [Member] Forward loan sales commitments Forward Contracts [Member] Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] [Line Items] for Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Net income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Originations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Principal paydowns / settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Ending balance Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Beginning balance Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Net income Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Sales Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales Originations Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases Principal paydowns / settlements Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Ending balance Fair Value, Option, Quantitative Disclosures [Table] Fair Value, Option, Quantitative Disclosures [Table] Eligible Item or Group for Fair Value Option [Axis] Eligible Item or Group for Fair Value Option [Axis] Fair Value, Option, Eligible Item or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Gain (Loss) on Sales of Consumer Loans Gain (Loss) on Sales of Consumer Loans [Member] Gain (Loss) on Sales of Consumer Loans [Member] Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Fair value carrying amount Assets, Fair Value Disclosure Aggregate unpaid principal amount Fair Value, Option, Loans Held as Assets, Aggregate Unpaid Principal Balance Fair Value, Option, Loans Held as Assets, Aggregate Unpaid Principal Balance Fair value carrying amount less aggregate unpaid principal Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables Net gain from initial measurement of the above loans and subsequent changes in fair value for loans outstanding Fair Value, Option, Changes in Fair Value, Gain (Loss) Document and Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Impaired loans with an allowance recorded Impaired Financing Receivable with Related Allowances [Member] Represents a subset of a class of financing receivables that have specific allowances related to the impaired receivables. Impaired loans without an allowance recorded Impaired Financing Receivable with No Related Allowances [Member] Represents a subset of a class of financing receivables that have no specific allowances related to the impaired receivables. Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Consumer real estate Consumer Real Estate Receivable [Member] Class of financing receivables related to consumer real estate receivables. Total commercial Commercial Receivables [Member] Class of financing receivables related to commercial real estate and commercial business. Commercial real estate Commercial Real Estate Receivables [Member] Class of financing receivables related to commercial real estate. Commercial business Commercial Business Receivables [Member] Class of financing receivables related to commercial business. Leasing and Equipment Finance Leasing and Equipment Finance Receivable [Member] Represents member for leasing and equipment finance portfolios. Inventory Finance Inventory Financing Receivable [Member] Represents member for inventory finance portfolios. Auto Finance Automobile Loan [Member] Other Other Receivable [Member] Represents an amount of other receivables that are not separately disclosed. Impaired Loans Financing Receivable, Impaired [Line Items] Unpaid Contractual Balance Impaired Financing Receivable, Unpaid Principal Balance Loan Balance Impaired Financing Receivable, Recorded Investment Related Allowance Recorded Impaired Financing Receivable, Related Allowance Average Loan Balance Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] TCF Financial Corporation Parent [Member] Preferred Stock Preferred Stock [Member] TCF Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Treasury Stock and Other Treasury Stock [Member] Non-controlling Interests Noncontrolling Interest [Member] Statement Statement [Line Items] Increase (Decrease) in Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance (in shares) Shares, Issued Net income Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Net investment by (distribution to) non-controlling interest Noncontrolling Interest, Increase from Subsidiary Equity Issuance Dividends on preferred stock Dividends, Preferred Stock, Cash Dividends on common stock Dividends, Common Stock, Cash Grants of restricted stock Stock Issued During Period, Value, Restricted Stock Award, Gross Grants of restricted stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Common shares purchased by TCF employee benefit plans Stock Issued During Period, Value, Employee Benefit Plan Common shares purchased by TCF employee benefit plans (in shares) Stock Issued During Period, Shares, Employee Benefit Plan Cancellation of shares of restricted stock Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Cancellation of shares of restricted stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Cancellation of common shares for tax withholding Adjustments Related to Tax Withholding for Share-based Compensation Cancellation of common shares for tax withholding (in shares) Shares Paid for Tax Withholding for Share Based Compensation Net amortization of stock compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock compensation tax (expense) benefit Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Change in shares held in trust for deferred compensation plans, at cost Shares Held in Trust for Deferred Comp Plans Increase (Decrease) Net change in value during the period of stock held in trust under terms of deferred compensation plan. Balance Balance (in shares) Segment Reporting [Abstract] Business Segments Segment Reporting Disclosure [Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Contractual liabilities related to sale of loans Contractual liabilities related to sale of loans Contractual liabilities related to sale of loans Impairment related to consumer real estate interest-only strips Interest only Strips on Consumer Real Estate Impairment Amount Represents the amount of interest-only strips on consumer real estate loans impairment recorded during the period. Impairment related to auto finance interest-only strips Interest only Strips on Auto Finance Impairment Amount Represents the amount of interest-only strips on auto finance loans impairment recorded during the period. Summary of components of other comprehensive income and the related tax effects Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Schedule of accumulated other comprehensive income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Compensation and Retirement Disclosure [Abstract] Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Regulatory Capital Requirements Regulatory Capital Requirements under Banking Regulations [Text Block] Earnings Per Common Share Earnings Per Share [Text Block] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Forward foreign exchange contracts Foreign Exchange Forward [Member] Net Gains (Losses) Recognized In Income Statement Related To Derivative Instruments [Axis] Net Gains (Losses) Recognized In Income Statement Related To Derivative Instruments [Axis] Net Gains (Losses) Recognized In Income Statement Related To Derivative Instruments Net Gains (Losses) Recognized In Income Statement Related To Derivative Instruments [Domain] NetGainsLossesRecognizedInIncomeStatementRelatedToDerivativeInstruments [Domain] [Domain] for NetGainsLossesRecognizedInIncomeStatementRelatedToDerivativeInstruments [Axis] Net Realized Gain (Loss) On Derivative Instruments Recognized In Non-Interest Income Net Realized Gain (Loss) On Derivative Instruments Recognized In Non-Interest Income [Member] Net Realized Gain (Loss) On Derivative Instruments Recognized In Non-Interest Income Net Realized Gain (Loss) On Derivative Instruments Recognized In Non-Interest Expense Net Realized Gain (Loss) On Derivative Instruments Recognized In Non-Interest Expense [Member] Net Realized Gain (Loss) On Derivative Instruments Recognized In Non-Interest Expense Fair Value Hedging Fair Value Hedging [Member] Derivatives instruments, gain (loss) Derivative Instruments, Gain (Loss) [Line Items] Derivative, gain (loss) on derivative Derivative, Gain (Loss) on Derivative, Net Net investment hedges: Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Net unrealized gain (loss) Other Comprehensive Income, Derivatives Qualifying as Net Investment Hedges before Tax Period Increase (Decrease) Pre tax change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of net investment hedges, net of reclassifications into earnings during the period. Net unrealized gain (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Credit risk-related contingent features Derivative, Credit Risk Related Contingent Features [Abstract] Forward foreign exchange contracts with credit risk-related contingent features, notional value Forward Foreign Exchange Contracts with Credit Risk Related Contingent Features Notional Value Represents the notional amount of forward foreign exchange contracts with credit risk-related contingent features. Additional collateral required, if TCF was rated less than BB- by Standard and Poor's Additional Collateral, Aggregate Fair Value Forward foreign exchange contracts with credit risk-related contingent features, net liability amount Forward Foreign Exchange Contracts with Credit Risk Related Contingent Features Liability Amount Represents the net liability amount of forward foreign exchange contracts with credit risk-related contingent features. Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Subordinated bank notes Subordinated Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Maturity Year 2025 Maturity Year 2025 [Member] Maturity Year 2025 [Member] Measurement of fair value on a non-recurring basis Fair Value, Measurements, Nonrecurring [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Debt Instrument, Face Amount Debt Instrument, Face Amount Asset Impairment Charges Asset Impairment Charges Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plan Pension Plan [Member] Postretirement Plan Other Postretirement Benefit Plan [Member] Employee Benefit Plans Defined Benefit Plan Disclosure [Line Items] Net periodic benefit cost included in compensation and employee benefits expense Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Interest cost Defined Benefit Plan, Interest Cost Return on plan assets Defined Benefit Plan, Actual Return on Plan Assets Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Net periodic benefit plan cost Defined Benefit Plan, Net Periodic Benefit Cost TCF contributions Defined Benefit Plan, Contributions by Employer Time Deposits, $250,000 or more Time Deposits, $250,000 or more The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more Weighted-Average Rate Interest Bearing Deposit Liabilities Weighted Average Rate [Abstract] Interest bearing Interest Bearing Checking Deposits Weighted Average Rate Represents the weighted average interest rate for interest bearing checking accounts. Total checking Total Checking Deposits Weighted Average Rate Represents the weighted average interest rate for total checking accounts. Savings Interest Bearing Deposits Savings Deposits Weighted Average Rate Represents the weighted average interest rate for interest bearing savings deposit accounts. Money market Interest Bearing Deposits Money Market Deposits Weighted Average Rate Represents the weighted average interest rate for interest bearing money market deposit accounts. Certificates of deposit Interest Bearing Certificates of Deposits Weighted Average Rate Represents the weighted average interest rate for interest bearing certificate of deposit liabilities. Total deposits Interest Bearing Deposits Weighted Average Rate Represents the weighted average interest rate for all interest bearing deposit liabilities. Deposits Deposits, by Type [Abstract] Non-interest bearing Noninterest Bearing Deposit Checking Amount of non-interest bearing checking deposit liabilities. Interest bearing Interest Bearing Deposit Checking Amount of interest bearing checking deposit liabilities. Total checking Demand Deposit Accounts Savings Deposits, Savings Deposits Money market Deposits, Money Market Deposits Certificates of deposit Time Deposits Total deposits Deposits % of Total Percentage of Interest Bearing Deposit Liabilities to Deposit Liabilities [Abstract] Non-interest bearing Percentage of Non Interest Bearing Deposits to Total Deposits Represents the percentage of non-interest bearing checking demand deposit liabilities to total deposit liabilities. Interest bearing Percentage of Interest Bearing Deposits to Total Deposits Percentage of interest bearing checking demand deposit liabilities to total deposit liabilities. Total checking Percentage of Total Checking Deposits to Total Deposits Percentage of interest bearing demand deposit liabilities to total deposit liabilities. Savings Percentage of Savings Deposits to Total Deposits Percentage of interest bearing savings deposit liabilities to total deposit liabilities. Money market Percentage of Money Market Deposits to Total Deposits Percentage of interest bearing money market demand account deposit liabilities to total deposit liabilities. Certificates of deposit Percentage of Deposits, Certificates of Deposit, to Total Deposits Percentage of interest bearing certificates of deposit liabilities to total deposit liabilities. Total deposits Percentage of Total Deposits to Total Deposits Percentage of total deposit liabilities. Denominations $100 Thousand or Greater Contractual Maturities, Time Deposits, $100,000 or More [Abstract] 0-3 months Contractual Maturities, Time Deposits, $100,000 or More, Three Months or Less 4-6 months Contractual Maturities, Time Deposits, $100,000 or More, Four Months Through Six Months The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more, for the period from four months through six months after the balance sheet date. 7-12 months Contractual Maturities, Time Deposits, $100,000 or More, Seven Months Through 12 Months The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more, for the period from seven months through twelve months after the balance sheet date. Over 12 months Contractual Maturities, Time Deposits, $100,000 or More, Thirteen Months Through 24 Months Represents the amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more, for the period from thirteen months through twenty four months after the balance sheet date. Total Time Deposits, $100,000 or More Denominations Less Than $100 Thousand Contractual Maturities, Time Deposits, Less than $100,000 [Abstract] 0-3 months Contractual Maturities, Time Deposits, Less than $100,000, Three Months or Less The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of less than $100,000, for three months or less from the balance sheet date. 4-6 months Contractual Maturities, Time Deposits, Less than $100,000, Four Months Through Six Months The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of less than $100,000, for the period from four months through six months after the balance sheet date. 7-12 months Contractual Maturities, Time Deposits, Less than $100,000, Seven Months Through 12 Months The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of less than $100,000, for the period from seven months through twelve months after the balance sheet date. Over 12 months Contractual Maturities, Time Deposits, Less than $100,000, Thirteen Months Through 24 Months Represents the amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of less than $100,000, for the period from thirteen months through twenty four months after the balance sheet date. Total Time Deposits, Less than $100,000 Total Time Deposits, Fiscal Year Maturity [Abstract] 0-3 months Contractual Maturities Time Deposits Three Months or Less The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts), for three months or less from the balance sheet date. 4-6 months Contractual Maturities, Time Deposits, Four Months Through Six Months The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts), for the period from four months through six months after the balance sheet date. 7-12 months Contractual Maturities, Time Deposits, Seven Months Through 12 Months The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts), for the period from seven months through twelve months after the balance sheet date. Over 12 months Contractual Maturities, Time Deposits, Thirteen Months Through 24 Months The amount of contractual maturities of domestic and foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts), for the period from thirteen months through twenty months after the balance sheet date. Total Assets: Assets [Abstract] Cash and due from banks Cash and Due from Banks Investments Other Investments Securities available for sale Loans and leases held for sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans and leases: Loans and Leases Receivable, Net Amount [Abstract] Consumer real estate: Loans and Leases Receivable, Gross, Consumer, Real Estate [Abstract] First mortgage lien Loans and Leases Receivable Consumer First Mortgage Lien This element represents consumer real estate loans secured by a first mortgage lien position. Junior lien Loans and Leases Receivable Consumer Junior Lien This element represents consumer real estate loans secured by a junior lien position. Total consumer real estate Loans and Leases Receivable, Gross, Consumer, Real Estate Commercial Loans and Leases Receivable, Commercial, Net of Deferred Income Leasing and equipment finance Leases Receivable Commercial Lease and Equipment Financing Reflects the net carrying amount of commercial loans (money lent to commercial entities rather than consumers) made in the form of direct financing and equipment leases where the reporting entity (lessor) only recognizes interest revenue from the lease. Inventory finance Loans Receivable, Inventory Financing, Net of Deferred Income Reflects the net carrying amount of unpaid commercial variable rate loans which are secured by the underlying floor planned equipment and supported by repurchase agreements from original equipment manufacturers. Auto finance Loans Receivable, Auto Finance The gross amount of loans and leases receivables related to auto finance as on reporting date. Other Loans and Leases Receivable, Gross, Other Total loans and leases Loans and Leases Receivable, Net of Deferred Income Allowance for loan and lease losses Net loans and leases Loans and Leases Receivable, Net Amount Premises and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Other assets Other Assets Total assets Assets Liabilities and Equity: Liabilities and Equity [Abstract] Deposits: Checking Short-term borrowings Short-term Debt Long-term borrowings Long-term Debt Total borrowings Debt and Capital Lease Obligations Accrued expenses and other liabilities Other Liabilities Total liabilities Liabilities Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Preferred stock, par value $0.01 per share, 30,000,000 shares authorized; 4,006,900 issued Preferred Stock, Value, Issued Common stock, par value $0.01 per share, 280,000,000 shares authorized; 170,647,255 and 169,887,030 shares issued, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings, subject to certain restrictions Retained Earnings Accumulated Deficit Subject to Restrictions The cumulative amount of the entity's undistributed earnings or deficit. A portion of the earnings are restricted by legal appropriation for thrift bad debt reserves. Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock at cost, 42,566 shares, and other Treasury Stock Value and Common Stock Issued, Employee Trust Deferred Treasury stock at cost, plus shares held in trust for deferred compensation plans, at cost. Total TCF Financial Corporation stockholders' equity Stockholders' Equity Attributable to Parent Non-controlling interest in subsidiaries Stockholders' Equity Attributable to Noncontrolling Interest Total equity Total liabilities and equity Liabilities and Equity Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Operating Segments [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Consumer Banking Consumer Banking [Member] [Member] Consumer Banking [Member] Wholesale Banking Wholesale Banking [Member] Wholesale Banking [Member] Enterprise Services Enterprise Services [Member] Enterprise Services [Member] Segment Reporting Information Segment Reporting Information [Line Items] Revenue (expense) from operations: Segment Reporting Information, Operating Revenue (Expense) [Abstract] Net interest income Non-interest income Non-interest expense Income tax expense (benefit) Preferred stock dividends Total assets Revenues from external customers: Segment Reporting Information, Revenue for Reportable Segment [Abstract] Interest income Non-interest income Noninterest Income after Intersegment Eliminations This element represents the total amount of noninterest income after intersegment eliminations which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. Total Revenues Schedule of selected information for short-term borrowings (borrowings with an original maturity of one year or less) Schedule of Short-term Debt [Table Text Block] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing receivables Class of Financing Receivables [Member] Represents the class of financing receivables. Classes of financing receivables are generally a disaggregation of a portfolio segment. Consumer Real Estate Consumer Real Estate and Other Receivable Excluding Portfolios Acquired with Deteriorated Credit Quality [Member] Represents member for consumer real estate and other receivable portfolios excluding portfolios acquired with deteriorated credit quality. Consumer real estate loans to customers in bankruptcy Consumer Real Estate Loans to Customers in Bankruptcy [Member] Represents the consumer real estate loans to customers in bankruptcy. Leasing and equipment finance Leasing and Equipment Finance Receivable Excluding Portfolios Acquired with Deteriorated Credit Quality [Member] Represents member for leasing and equipment finance portfolios excluding portfolios acquired with deteriorated credit quality. Auto finance Auto Financing Receivable Excluding Portfolios Acquired with Deteriorated Credit Quality [Member] Represents member for auto finance portfolios excluding portfolios acquired with deteriorated credit quality. Other Other Financing Receivable [Member] Represents member for other finance portfolios. Portfolios acquired with deteriorated credit quality Receivable Acquired with Deteriorated Credit Quality [Member] Financing receivables that were acquired with deteriorated credit quality. Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] Current-59 Days Delinquent and Accruing Financing Receivables, 0 to 59 Days Past Due [Member] Financing Receivables, 0 to 59 Days Past Due [Member] 60-89 Days Delinquent and Accruing Financing Receivables, 60 to 89 Days Past Due [Member] 90 Days or More Delinquent and Accruing Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Accruing and Non-accrual Loans and Leases Financing Receivable, Recorded Investment, Past Due [Line Items] Current and Delinquent and Accruing Financing Receivable, Recorded Investment, Current and Past Due Financing Receivable, Recorded Investment, Current and Past Due Delinquent and Accruing Financing Receivable, Recorded Investment, Past Due Non-accrual Financing Receivable, Recorded Investment, Nonaccrual Status Allowance for credit losses (Less than $0.1 million for commercial borrowing during 2015) Interest income recognized on loans and leases in non-accrual status and contractual interest that would have been recorded had the loans and leases performed in accordance with their original contractual terms Loans and Leases Receivable Impaired Contractual Interest Due and Interest Recognized on Nonaccrual Loans [Abstract] Contractual interest due on non-accrual loans and leases Loans and Leases Receivable Impaired Interest Due on Nonaccrual Loans Reflects the contractual interest due on the non-accrual loans and leases. Interest income recognized on non-accrual loans and leases Loans and Leases Receivable Impaired Interest Recognized on Nonaccrual Loans The interest income recognized in the period on loans and leases in non-accrual status. Unrecognized interest income Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Federal funds purchased Federal Funds Purchased [Member] Securities sold under repurchase agreements Securities Sold under Agreements to Repurchase [Member] Line of Credit - TCF Commercial Finance Canada, Inc. Line of Credit [Member] Mortgage-backed securities Collateralized Mortgage Backed Securities [Member] Short-term Borrowings Short-term Debt [Line Items] Short-term borrowings Interest rate at period end (as a percent) Debt Instrument, Interest Rate, Effective Percentage Average daily balances of short-term borrowings Short-term Debt, Average Outstanding Amount Average daily interest rate (as a percent) Debt Instrument, Interest Rate During Period Maximum month-end balances of short-term borrowings Short-term Debt, Maximum Month-end Outstanding Amount Fair value of short-term debt Available-for-sale Securities Pledged as Collateral Basis of Presentation Basis of Accounting, Policy [Policy Text Block] New Accounting Pronouncement New Accounting Pronouncements, Policy [Policy Text Block] Change in Segment Reporting Segment Reporting, Policy [Policy Text Block] Information about long-term borrowings Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Non-participating restricted stock, stock options and warrants Non Participating Restricted Stock, Stock Options and Warrants [Member] Incremental common shares that are attributable to non-participating restricted stock, stock options and warrants that were not included in diluted earnings per share (EPS) because to do so would have increased EPS amount or decreased loss per share amount for the period presented. Antidilutive Securities Excluded from Computation of Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Short-term Borrowings Short-term Debt [Text Block] Minimum period for loans to be delinquent to be considered in default Minimum Period of Loans Delinquent to be Considered in Default Represents the minimum period for loans to be delinquent to be considered in default. Loan Balance Financing Receivable, Modifications, Subsequent Default, Recorded Investment Total TDR loans modified in the applicable period Financing Receivable Modifications in Last Twelve Months The balance of financing receivables that have been modified within 12 months of the beginning of the respective reporting period. Defaulted modified TDR loans as a percent of total TDR loans modified in the applicable period Defaulted Modified Loan Balance as Percent of Total Loan Balance Represents the balance of defaulted modified loans as a percent of the total loan balance. Securities Available for Sale and Securities Held to Maturity Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Consumer Real Estate Consumer Real Estate and Other Receivable [Member] Class of financing receivables related to consumer real estate and other receivables. Commercial Allowance for loan and lease losses, other credit loss reserves Financing Receivable, Allowance for Credit Losses [Line Items] Allowance for loan and lease losses Allowance for Loan and Lease Losses [Roll Forward] Balance, beginning of period Charge-offs Allowance for Loan and Lease Losses, Write-offs Recoveries Allowance for Loan and Lease Loss, Recovery of Bad Debts Net (charge-offs) recoveries Allowance for Loan and Lease Losses Write-offs, Net Other Allowance for Loan and Lease Losses, Adjustments, Other Balance, end of period Allowance for loan and lease losses and other information Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent [Table Text Block] Allowance for loan and lease losses and balances by type of allowance methodology Allowance for Credit Losses on Financing Receivables [Table Text Block] Information regarding accruing and non-accruing loans and leases Schedule of Financing Receivables Accruing and Non Accrual Status [Table Text Block] Tabular disclosure of accruing, and nonaccrual financing receivables (such as loans and trade receivables), including: (a) the recorded investment in loans and trade receivables, if applicable, on nonaccrual status as of each balance sheet date (b) the recorded investment in loans and trade receivables, if applicable, past due 90 days or more and still accruing. Interest income recognized on loans and leases in non-accrual status and contractual interest Schedule of Financing Receivables Non Accrual Status Interest Income Recognized [Table Text Block] Tabular disclosure of interest income recognized on financing receivables in non-accrual status and contractual interest possibly to be recorded if financing receivables perform in accordance with their original contractual terms. Summary of consumer real estate loans to customers in bankruptcy Schedule of Past Due Financing Receivables in Bankruptcy [Table Text Block] Tabular disclosure of financing receivables to customers in bankruptcy. This includes financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on non-accrual status. Schedule of accruing loans that were restructured within 12 months and defaulted Financing Receivable Troubled Debt Restructurings that Subsequently Defaulted [Table Text Block] Tabular disclosure of troubled debt restructurings in which a modification was made within 12 months of the beginning of the reporting period and for which there was a payment default in the current reporting period by class of financing receivable and portfolio segment. Impaired loans included in previous amounts disclosed within performing and non-accrual loans and leases and loan modifications for borrowers with financial difficulties Impaired Financing Receivables [Table Text Block] Average balance of impaired loans and interest income recognized on impaired loans Schedule of Impaired Financing Receivables Average Balance and Interest Income Recognized [Table Text Block] Tabular disclosure of the average balance of impaired financing receivables and interest income recognized on impaired financing receivables during the period. Reportable segments, including a reconciliation of consolidated totals Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Omnibus Incentive Plan [Member] tcb_Omnibus Incentive Plan [Member] tcb_Omnibus Incentive Plan [Member] Incentive Stock Program [Member] tcb_Incentive Stock Program [Member] tcb_Incentive Stock Program Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock [Member] Restricted Stock [Member] Performance Based Restricted Stock [Member] Performance Based Restricted Stock [Member] Performance-based restricted stock that will vest only if certain return on equity goals or service conditions, as defined in the Program, is achieved. Employee Stock Option [Member] Employee Stock Option [Member] Performance Shares [Member] Performance Shares [Member] Minimum [Member] Maximum [Member] Share-based compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Unrecognized stock compensation expense for restricted stock awards and options Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average amortization period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Outstanding number of shares to vest only if certain return on asset goals, and service conditions are achieved Share Based Compensation Arrangement by Share Based Payment Award Number of Shares to Vest upon Achievements of Certain Goals Represents the number of shares that will vest upon achievement of certain goals under the equity-based compensation plan. Restricted stock, maximum multiplier Share-based Compensation Arrangement by Share-based Payment Award, Maximum Multiplier Share-based Compensation Arrangement by Share-based Payment Award, Maximum Multiplier Valuation and related assumption information for stock option plans Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Restricted stock, shares activity Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Forfeited/cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Outstanding at the end of the period (in shares) Restricted Stock, Grant Date Fair Value Range Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Grant Date Fair Value [Roll Forward] Grant Date Fair Value, Outstanding at the beginning (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Grant Date Fair Value Grant Date Fair Value, Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value Grant Date Fair Value, Forfeited/canceled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Grant Date Fair Value Grant Date Fair Value, Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Grant Date Fair Value Grant Date Fair Value, Outstanding at the end (in dollars per share) Restricted Stock, Weighted-Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted-Average Grant Date Fair Value, Outstanding at the beginning (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Forfeited/cancelled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Outstanding at the end (in dollars per share) Stock options, shares activity Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Forfeited/canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Outstanding at the end of the period (in shares) Stock Options, Exercise Price Range Share Based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Roll Forward] Exercise price, Outstanding at the beginning (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Exercise Price Exercise price, Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price Exercise price, Forfeited/canceled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price Exercise price, Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Exercise Price Exercise price, Outstanding at the end (in dollars per share) Weighted- Average Remaining Contractual Life in Years Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted-Average Exercise Price Share Based Compensation Arrangement by Share Based Payment Award, Options Weighted Average Exercise Price [Abstract] Weighted-Average Exercise Price, Outstanding at the beginning (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-Average Exercise Price, Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted-Average Exercise Price, Forfeited/canceled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted-Average Exercise Price, Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Weighted-Average Exercise Price, Outstanding at the end (in dollars per share) Stock options outstanding and exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Stock Options Exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercise price, Stock options exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Exercise Price Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Correspondent Lending Sales proceeds, net sales proceeds, net sales proceeds, net Recorded investment in loans sold, including accrued interest Recorded investment in loans sold, including accrued interest Recorded investment in loans sold, including accrued interest Interest-only strips, initial value Interest-only strips, initial value Interest-only strips, initial value Net gains Gain (loss) on sale of loans, net of subsequent adjustments and valuation adjustments Gain (loss) on sale of loans, net of subsequent adjustments and valuation adjustments Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables Acquired with Deteriorated Credit Quality Receivables Acquired with Deteriorated Credit Quality [Member] Allowance for loan and lease losses: Loans and Leases Receivable, Allowance [Abstract] Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Total Loans and leases outstanding: Loans and Leases Receivable, Net of Deferred Income [Abstract] Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Loans acquired with deteriorated credit quality Financing Receivable, Net Consumer real estate and other: Loans and Leases Receivable Consumer Real Estate and Other [Abstract] First mortgage lien, Percent Change Loans and Leases Receivable Consumer Mortgage Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of consumer first mortgage lien loans when comparing the current period end and the period end of the previous fiscal year. Junior lien, Percent Change Loans and Leases Receivable Consumer Junior Lien Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of consumer junior lien loans when comparing the current period end and the period end of the previous fiscal year. Total consumer real estate, Percent Change Loans and Leases Receivable Consumer Real Estate Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of total consumer real estate loans when comparing the current period end and the period end of the previous fiscal year. Commercial: Commercial real estate: Loans Receivable, Gross, Commercial, Real Estate [Abstract] Permanent Loans Receivable, Gross, Commercial, Mortgage Permanent, Percent Change Loans Receivable, Commercial Real Estate Permanent Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of permanent commercial real estate loans when comparing the current period end and the period end of the previous fiscal year. Construction and development Loans Receivable, Commercial Construction and Development This element represents the gross carrying amount of unpaid loans that had been issued to businesses to construct a facility and develop land for sale. Acquisition, development and construction (ADC) loans are generally issued sequentially and the net proceeds of the latest debt are used by the borrower to pay off the preceding loan. A construction loan is generally expected to be paid off with the net proceeds from permanent financing. Construction and development, Percent Change Loans Receivable, Commercial Construction and Development Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of construction and development loans related to commercial real estate when comparing the current period end and the period end of the previous fiscal year. Total commercial real estate Total commercial real estate, Percent Change Loans Receivable, Commercial Real Estate Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of total commercial real estate loans when comparing the current period end and the period end of the previous fiscal year. Commercial business: LoansReceivableCommercialBusiness [Abstract] Commercial business Loans Receivable, Commercial Business This element represents the gross carrying amount of unpaid commercial loans secured by business assets other than real estate, including inventory, receivables, equipment and financial instruments. Commercial business, Percent Change Loans Receivable, Commercial Business Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of commercial business loans when comparing the current period end and the period end of the previous fiscal year. Total commercial Total commercial, Percent Change Loans and Leases Receivable Commercial Net of Deferred Income Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of total commercial loans when comparing the current period end and the period end of the previous fiscal year. Leasing and equipment finance: LeasesReceivableCommercialLeaseAndEquipmentFinancing [Abstract] Leasing and equipment finance, Percent Change Leases Receivable Commercial Lease and Equipment Financing Percent Change Period End over Year End