Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] 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] 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] Measurement of fair value on a non-recurring basis Fair Value, Measurements, Nonrecurring [Member] 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] Mortgage-backed securities, Other Mortgage-backed Securities, Issued by Private Enterprises [Member] Obligations of states and political subdivisions US States and Political Subdivisions Debt Securities [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Loans and leases held for sale Loans And Leases Held-For-Sale [Member] Loans And Leases Held-For-Sale [Member] Forward foreign exchange contracts Foreign Exchange Forward [Member] Interest rate contracts Swap [Member] Interest rate lock commitments Interest Rate Lock Commitments [Member] Forward loan sales commitments Forward Contracts [Member] Assets held in trust for deferred compensation plans Assets Held in Trust for Deferred Compensation Plans [Member] This element represents the assets held in trust for deferred compensation plans. Liabilities held in trust for deferred compensation plans Liabilities Held in Trust for Deferred Compensation Plans [Member] Represents the liabilities held in trust for deferred compensation plans. Other contracts Other Contract [Member] 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. Commercial real estate Commercial Real Estate Receivables [Member] Class of financing receivables related to commercial real estate. Fair Value, Assets and liabilities measured at fair value on Recurring and Nonrecurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair value carrying amount Assets, Fair Value Disclosure Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Securities held to maturity Held-to-maturity Securities Loans Loans Receivable, Fair Value Disclosure Interest-only strips Interest Only Strips, Fair Value Disclosure Represents the total fair market value of interest-only strips. Real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Repossessed and returned assets Repossessed and Returned Equipment, Fair Value Disclosure Represents the fair value of repossessed and returned equipment. Segment Reporting [Abstract] Business Segments Segment Reporting Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] 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] Other Contract 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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [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 Deposits [Abstract] 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. 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] 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) Statement of Financial Position [Abstract] Assets: Assets [Abstract] Cash and due from banks Cash and Due from Banks Investments Other Investments Securities available for sale Available-for-sale Securities 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 Loans and Leases Receivable, Allowance 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 Demand Deposit Accounts Savings Deposits, Savings Deposits Money market Deposits, Money Market Deposits Certificates of deposit Time Deposits Total deposits Deposits 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; 169,473,142 and 167,503,568 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 Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Investments, Debt and Equity Securities [Abstract] Securities Available for Sale and Securities Held to Maturity Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Debt Disclosure [Abstract] Schedule of selected information for short-term borrowings (borrowings with an original maturity of less than one year) Schedule of Short-term Debt [Table Text Block] Statement of Comprehensive Income [Abstract] Net income attributable to TCF Financial Corporation Net Income (Loss) Attributable to Parent Other comprehensive income (loss): Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Securities available for sale: Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, [Abstract] Unrealized gains (losses) arising during the period Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Reclassification of net (gains) losses to net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Net investment hedges: Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract] Unrealized gains (losses) arising during the period Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Foreign currency translation adjustment: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract] Unrealized gains (losses) arising during the period Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Recognized postretirement prior service cost: Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract] Reclassification of net (gains) losses to net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax Income tax (expense) benefit Other Comprehensive Income (Loss), Tax Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Receivables [Abstract] 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] Schedule of Loans and Leases Receivable Consumer Home Equity [Table] Schedule of Loans and Leases Receivable Consumer Home Equity [Table] Represents the information pertaining to various types of loans made to individuals for personal needs, including mortgage, home equity, credit card, installment, and lease financing. Such loans may be used for general purposes or are limited by the terms of the debt instrument for a specific purpose or purposes, and may be fully or partially secured or are unsecured. 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] Consumer Borrower Consumer 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] First mortgage lien First Mortgage [Member] HELOCs Loans and Leases Receivable Consumer Home Equity [Line Items] HELOCs included in consumer real estate junior lien portfolio Loans and Leases Receivable, Gross, Consumer, Home Equity Amortizing junior lien mortgage loans included in consumer real estate junior lien portfolio Loans and Leases Receivable, Gross, Consumer, Mortgage Portion of HELOCs in initial interest-only draw period Loans and Leases Receivable Portion of Consumer Home Equity in Initial Draw Period Represents the portion of amount before allowance of revolving, open-end loan, extended under a line of credit and secured by the borrower's residential property, with feature of interest-payments only for initial interest-only draw period. Initial Interest-only Draw Period Loans and Leases Receivable Consumer Home Equity Initial Draw Period Represents the initial interest-only draw period for the consumer home equity line of credit. Loans and Leases Receivable Consumer Home Equity Amortization Repayment Period Loans and Leases Receivable Consumer Home Equity Amortization Repayment Period Represents the amortization repayment period for the consumer home equity line of credit. HELOCs with interest-only revolving draw programs Loans and Leases Receivable Portion of Consumer Home Equity Line of Credit with Interest only Revolving Draw Programs Represents the portion of amount before allowance of revolving, open-end loan, extended under a line of credit and secured by the borrower's residential property, with feature of interest-payments only for a specified term of loan under revolving program. Draw period for the HELOCs Loans and Leases Receivable Consumer Home Equity Line of Credit with Interest Only Revolving Draw Period Represents the draw period for drawing the required loan amount from the credit available of the consumer home equity line of credit with interest- only payments under revolving draw program. Loans and Leases Receivable Percentage of Consumer Home Equity Line of Credit with Interest only Revolving Draw Programs Maturing Prior to Specified Period Loans and Leases Receivable Percentage of Consumer Home Equity Line of Credit with Interest only Revolving Draw Programs Maturing Prior to Specified Period Represents the percentage of home equity lines of credit loans maturing prior to the specified period. Consumer auto loans transferred Transfer of Consumer Auto Loans Transfer of Consumer Auto Loans Proceeds from transfer of consumer auto loans Proceeds From Transfer Of Consumer Auto Loans Proceeds From Transfer Of Consumer Auto Loans Gains on transfer of consumer auto loans before adjustment Gain (Loss) on Transfer of Consumer Auto Loans before Adjustment Gain (Loss) on Transfer of Consumer Auto Loans before Adjustment 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. Compensation and Retirement Disclosure [Abstract] 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 (income) cost Defined Benefit Plan, Net Periodic Benefit Cost Contributions to the plan during the period Defined Benefit Plan, Contributions by Employer Benefits paid during the period Defined Benefit Plan, Benefits Paid Investment Holdings [Table] Investment Holdings [Table] Mortgage-backed securities: Collateralized Mortgage Backed Securities [Member] Other securities Other Debt Obligations [Member] Securities available for sale and securities held to maturity Investment Holdings [Line Items] Securities available for sale: Available-for-sale Securities [Abstract] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Weighted-average yield Weighted Average Yield on Securities Available For Sale This element represents the weighted-average yield percentage on securities available for sale as of the balance sheet date. Available-for-sale securities sold during period Available-for-sale Securities, Amount Sold During Period Available-for-sale Securities, Amount Sold During Period Proceeds from sales of securities Proceeds from Sale of Available-for-sale Securities Gross gains recognized on sales of securities Available-for-sale Securities, Gross Realized Gains Securities available for sale pledged as collateral Available-for-sale Securities Pledged as Collateral Impairment charges Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities Securities held to maturity: Held-to-maturity Securities, Parenthetical Disclosure [Abstract] Amortized Cost Gross Unrealized Gains Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Gross Unrealized Losses Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Fair Value Held-to-maturity Securities, Fair Value Weighted-average yield Weighted Average Yield on Securities Held to Maturity Represents the weighted-average yield percentage on securities held-to-maturity as of the balance sheet date. Value of available for sale mortgage-backed securities transferred to held to maturity Available-for-sale Securities Transferred to Held-to-maturity Securities Value For any transfer of securities categorized as available-for-sale, this item represents the amount of the transferred security to held-to-maturity investments. Unrealized holding loss on the transferred securities retained in accumulated other comprehensive income Unrealized Holding Gain (Loss) Transfers from Available for Sale to Held to Maturity Retained in Accumulated Other Comprehensive Income Represents the amount of unrealized holding gain (loss) related to transfers of securities into the held-to-maturity. Impairment charge on held to maturity securities Other than Temporary Impairment Losses, Investments 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. Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] 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] Allowance for Loan and Lease Losses and Credit Quality Information Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] 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. 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] Accruing and Non-accrual Loans and Leases Financing Receivable, Recorded Investment, Past Due [Line Items] 0-59 days delinquent and accruing Financing Receivable, Recorded Investment, Current and Past Due Financing Receivable, Recorded Investment, Current and Past Due 60 days delinquent and accruing Financing Receivable, Recorded Investment, Past Due Non-accrual Financing Receivable, Recorded Investment, Nonaccrual Status Total loans and leases 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. Junior lien Second Mortgage [Member] Total commercial Commercial Receivables [Member] Class of financing receivables related to commercial real estate and commercial business. Commercial business Commercial Business Receivables [Member] Class of financing receivables related to commercial business. 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. Inventory Finance Inventory Financing Receivable [Member] Represents member for inventory finance portfolios. 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. 90 Days or More Delinquent and Accruing Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Current and Delinquent and Accruing Delinquent and Accruing 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 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 Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Commitments and Contingencies Disclosure [Abstract] Litigation Contingencies Legal Matters and Contingencies [Text Block] 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. Leasing and Equipment Finance Leasing and Equipment Finance Receivable [Member] Represents member for leasing and equipment 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 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: Loans and Leases Receivable, Gross, Commercial [Abstract] 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 Loans Receivable, Gross, 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 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, Percent Change Leases Receivable Commercial Lease and Equipment Financing Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of total leasing and equipment finance when comparing the current period end and the period end of the previous fiscal year. Inventory finance, Percent Change Loans Receivable, Inventory Financing Net of Deferred Income Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of inventory finance when comparing the current period end and the period end of the previous fiscal year. Auto finance, Percentage Change Loans Receivable Auto Finance Percent Change, Period End over Year End This element represents the percentage increase (decrease) in a reported value of auto finance when comparing the current period end and the period end of the previous fiscal year. Other finance, Percent Change Loans and Leases Receivable Other Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of other finance when comparing the current period end and the period end of the previous fiscal year. Total loans and leases, Percent Change Loans and Leases Receivable Net of Deferred Income Percent Change Period End over Year End This element represents the percentage increase (decrease) in a reported value of total loans and leases when comparing the current period end and the period end of the previous fiscal year. Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Provision for credit losses Provision for Loan and Lease Losses Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Proceeds from sales of loans and leases held for sale Increase (Decrease) in Loans Held-for-sale Gains on sales of assets, net Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Net income attributable to non-controlling interest Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Nonredeemable Originations of loans held for sale, net of repayments Originations of Loans Held For Sale Represents the expenses associated with the origination of loans held for sale during the period. Net change in other assets and accrued expenses and other liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Other, net Other Noncash Income (Expense) Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Loan originations and purchases, net of principal collected on loans and leases Payments for (Proceeds from) Loans and Leases Purchases of equipment for lease financing Payments to Acquire Equipment on Lease Proceeds from sales of loans Proceeds from Sale of Loans Held-for-investment Proceeds from sales of lease receivables Proceeds from Leases Held-for-investment Purchases of securities Payments to Acquire Available-for-sale Securities Proceeds from maturities of and principal collected on securities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Purchases of Federal Home Loan Bank stock Payments to Acquire Federal Reserve Bank Stock Redemption of Federal Home Loan Bank stock Proceeds from Sale of Federal Reserve Bank Stock Proceeds from sales of real estate owned Proceeds from Sale of Foreclosed Assets Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Other, net Payments for (Proceeds from) Other Investing Activities Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Net change in deposits Increase (Decrease) in Deposits Net change in short-term borrowings Proceeds from (Repayments of) Short-term Debt Proceeds from long-term borrowings Proceeds from Issuance of Long-term Debt Payments on long-term borrowings Repayments of Long-term Debt Redemption of subordinated debt Maturities of Subordinated Debt Net investment by (distribution to) non-controlling interest Proceeds from (Payments to) Noncontrolling Interests Dividends paid on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Stock compensation tax (expense) benefit Excess Tax Benefit from Share-based Compensation, Financing Activities Common shares sold to TCF employee benefit plans Common Shares Sold to Employee Benefit Plan The cash inflow from the issuance of common stock that has been previously reacquired by the entity. Exercise of stock options Proceeds from Stock Options Exercised Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Net change in cash and due from banks Net Cash Provided by (Used in) Continuing Operations Cash and due from banks at beginning of period Cash and due from banks at end of period Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid (received) for: Supplemental Cash Flow Information Cash Paid Received [Abstract] [Abstract] Supplemental Cash Flow Information Cash Paid Received [Abstract] [Abstract] Interest on deposits and borrowings Interest Paid, Net Income taxes, net Income Taxes Paid, Net Transfer of loans to other assets Transfer of Loans and Leases to Other Assets Transfer of value of loans and leases held in the entity's portfolio to Other Assets. Transfer of securities available for sale to securities held to maturity Transfer of Securities Available for Sale to Securities Held to Maturity Represents the amount of transfer of securities available for sale to securities held to maturity. Cash and Cash Equivalents [Abstract] Cash and Due from Banks Cash and Cash Equivalents Disclosure [Text Block] Short-term Borrowings Short-term Debt [Text Block] 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 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, 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 Loans and leases held for sale Loans Held-for-sale, Fair Value Disclosure Loans: Consumer real estate Loans and Leases Receivable, Consumer, Net of Deferred Income 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 Allowance for loan losses 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). Standby letters of credit 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 Earnings Per Share [Abstract] Computation of basic and diluted earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Federal Home Loan Bank advances Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] Subordinated bank notes Subordinated Debt [Member] Discounted lease rentals Discounted Lease Rentals [Member] This element represents the lease rentals, which are discounted to their current value using specific discounting rate. Other long-term Other Long Term Debt [Member] Represents other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Maturity year 2015 Maturity Year 2015 [Member] This element represents the maturity year of long-term debt that will mature in 2015. Maturity year 2016 Maturity Year 2016 [Member] This element represents the maturity year of long-term debt that will mature in 2016. Maturity Year 2017 Maturity Year 2017 [Member] This element represents the maturity year of long-term debt that will mature in 2017. Maturity Year 2018 Maturity Year 2018 [Member] This element represents the maturity year of long-term debt that will mature in 2018. Maturity Year 2019 Maturity Year 2019 [Member] This element represents the maturity year of long-term debt that will mature in 2019. Maturity Year 2020 Maturity Year 2020 [Member] Maturity Year 2020 [Member] Maturity Year 2021 Maturity Year 2021 [Member] Maturity Year 2021 [Member] Maturity Year 2022 Maturity Year 2022 [Member] This element represents the maturity year of long-term debt that will mature in 2022. Maturity Year 2025 Maturity Year 2025 [Member] Maturity Year 2025 [Member] Maturity Year 2025, Interest Rate Swap Maturity Year 2025, Interest Rate Swap [Member] Maturity Year 2025, Interest Rate Swap [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] TCF Bank Subsidiaries [Member] Debt instrument Debt Instrument [Line Items] Long-term Debt Stated Rate Debt Instrument, Interest Rate, Stated Percentage Loans pledged as collateral Loans Pledged as Collateral Variable-rate FHLB advances prepayable monthly Federal Home Loan Bank, Advances, Maturities Summary, Floating Rate Debt instrument, face amount Debt Instrument, Face Amount Debt instrument, net of discount (as a percent) Debt Instrument, Net of Discount, Percent Debt Instrument, Net of Discount, Percent Debt issuance cost Debt Issuance Cost Derivative asset, notional amount Derivative, Notional Amount Earnings Per Common Share Earnings Per Share [Text Block] 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] 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] 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 Balance (in shares) Shares, Issued Net income attributable to TCF Financial Corporation Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income (loss) 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 Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock compensation tax (expense) benefit Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 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 (in shares) Balance Reportable segments, including a reconciliation of consolidated totals Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] 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] 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 Schedule of securities Unrealized Gain (Loss) on Investments [Table Text Block] Schedule of gross unrealized losses and fair value of securities available for sale and securities held to maturity that are in a loss position Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of amortized cost, fair value and yield of securities available for sale and securities held to maturity by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Basic Earnings Per Common Share: Earnings Per Share, Basic [Abstract] Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Earnings allocated to participating securities Net Income (Loss) Allocated to Participating Securities Basic The portion of net income (loss) allocated to participating security holders whose contracts entitle them to a portion of the entity's earnings or surplus and which is deducted from earnings available to common stockholders in order to derive the earnings allocated to common stockholders. Earnings allocated to common stock Net Income (Loss) Allocated to Common Stock Net income after making adjustment for dividends on preferred stock (declared in the period), dividends on cumulative preferred stock (accumulated for the period) and income allocated to participating securities. Weighted-average common shares outstanding for basic earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Basic Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted Earnings Per Common Share: Earnings Per Share, Diluted [Abstract] Earnings allocated to common stock Net Income (Loss) Allocated to Common Stock, Diluted Net income after making adjustment for dividends on preferred stock (declared in the period), dividends on cumulative preferred stock (accumulated for the period), income allocated to participating securities, and dilutive securities. Weighted-average common shares outstanding used in basic earnings per common share calculation (in shares) Net dilutive effect of: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Non-participating restricted stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted-average common shares outstanding for diluted earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted 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. 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 Yield, securities available for sale Available-for-sale Securities Debt Maturities Weighted Average Yield [Abstract] Due in one year or less (as a percent) Available-for-sale Securities Debt Maturities Next Rolling Twelve Months Weighted Average Yield Represents the weighted-average yield percentage on available-for-sale debt securities maturing in the first rolling twelve months following the latest balance sheet presented. Due in 1-5 years (as a percent) Available-for-sale Securities Debt Maturities One Through Five Years Weighted Average Yield Represents the weighted-average yield percentage on available-for-sale debt securities maturing in the first rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Due in 5-10 years (as a percent) Available for Sale Securities Debt Maturities Six Through Ten Years Weighted Average Yield Represents the weighted-average yield percentage on available-for-sale debt securities maturing in the sixth rolling twelve months through the tenth rolling twelve months following the latest balance sheet presented. Due after 10 years (as a percent) Available-for-sale Securities Debt Maturities after Ten Years Weighted Average Yield Represents the weighted-average yield percentage on available-for-sale debt securities maturing after the tenth rolling twelve months following the latest balance sheet presented. 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. 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 Yield, securities held to maturity Held to Maturity Securities Debt Maturities Weighted Average Yield [Abstract] Due in one year or less (as a percent) Held To Maturity Securities Debt Securities Next Rolling Twelve Months Weighted Average Yield Amount of held-to-maturity debt securities at fair value maturing in the rolling twelve months following the latest balance sheet presented. Due in 1-5 years (as a percent) Held to Maturity Securities Debt Maturities One Through Five Years Weighted Average Yield Represents the weighted-average yield percentage on held-to-maturity debt securities maturing in the first rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Due in 5-10 years (as a percent) Held to Maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield Held to Maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield Due after 10 (as a percent) Held to Maturity Securities Debt Maturities after Ten Years Weighted Average Yield Represents the weighted-average yield percentage on held-to-maturity debt securities maturing after the tenth rolling twelve months following the latest balance sheet presented. 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 Fair Value Disclosures Fair Value Disclosures [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 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 Home Loan Bank advances Federal Home Loan Bank Advances [Member] 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 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 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] Eliminations Intersegment Eliminations [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Lending Lending [Member] Represents the information about entity's Lending segment. Funding Funding [Member] Represents the information about entity's Funding segment. Support Services Support Services [Member] This element represents the information about entity's Support Services segment, which includes holding company and corporate functions that provide data processing, bank operations and other professional services to the operating segments. Segment Reporting Information Segment Reporting Information [Line Items] Revenue (expense) from operations: Segment Reporting Information, Operating Revenue (Expense) [Abstract] Net interest income Interest Income (Expense), Net Non-interest income Noninterest Income Non-interest expense Noninterest Expense Income tax expense (benefit) Income Tax Expense (Benefit) Income after income tax expense Income attributable to non-controlling interest Preferred stock dividends Total assets Revenues from external customers: Segment Reporting Information, Revenue for Reportable Segment [Abstract] Interest income Interest and Dividend Income, Operating 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 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] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Available-for-sale Securities Available-for-sale Securities [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 Loans and Leases Financing Receivables [Text Block] 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 Interest-bearing Deposits in Banks and Other Financial Institutions Interest-bearing Deposits in Banks and Other Financial Institutions Securities available for sale, Before Tax Unrealized gains (losses) arising during the period, Before Tax Reclassification of net (gains) losses to net income, Before Tax Net unrealized gains (losses), Before Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Securities available for sale, Tax Effect Other Comprehensive Income (Loss), Available-for-sale Securities, Tax [Abstract] Unrealized gains (losses) arising during the period, Tax Effect Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Reclassification of net (gains) losses to net income, Tax Effect Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Net unrealized gains (losses), Tax Effect Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Securities available for sale, Net of Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] Unrealized gains (losses) arising during the period, Net of Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification of net (gains) losses to net income, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Net unrealized gains (losses), Net of Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net investment hedges, Net of Tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract] Unrealized gains (losses) arising during the period, Before Tax Unrealized gains (losses) arising during the period, Tax Effect Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Unrealized gains (losses) arising during the period, Net of Tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Foreign currency translation adjustment, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] Unrealized gains (losses) arising during the period, Before Tax Unrealized gains (losses) arising during the period, Tax Effect Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Unrealized gains (losses) arising during the period, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Recognized postretirement prior service cost and translation obligation, Net of Tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax [Abstract] Reclassification of net (gains) losses to net income, Before Tax Reclassification of net (gains) losses to net income, Tax Effect Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax Reclassification of net (gains) losses to net income, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax Total other comprehensive loss, Net of Tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Total other comprehensive income (loss), Before Tax Other Comprehensive Income (Loss), before Tax Total other comprehensive income (loss), Tax Effect 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. 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. 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 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 Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock Compensation Disclosure of Compensation Related Costs, Share-based Payments [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 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 Information about long-term borrowings Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Commercial Borrower Commercial Borrower [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. Additional funds committed 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. Schedule of net periodic benefit cost included in compensation and employee benefits expense for cash balance Pension Plan and Postretirement Plan Schedule of Net Benefit Costs [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 expense: Interest Expense [Abstract] Deposits Interest Expense, Deposits Borrowings Interest Expense, Borrowings Total interest expense Interest Expense Net interest income 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 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 Operating lease depreciation Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease 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. 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.