Investments, All Other Investments [Abstract] Carrying values of investments Investment [Table Text Block] Debt Disclosure [Abstract] 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 Home Loan Bank Advances [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 borrowings 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 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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] TCF Bank Subsidiaries [Member] Federal Home Loan Bank, Advances, Option [Axis] Federal Home Loan Bank, Advances, Option [Axis] Federal Home Loan Bank, Advances, Option [Domain] Federal Home Loan Bank, Advances, Option [Domain] Federal Home Loan Bank advances Federal Home Loan Bank, Advances, Callable Option [Member] Debt instrument Debt Instrument [Line Items] Long-term borrowings Long-term Debt Stated Rate Debt Instrument, Interest Rate, Stated Percentage Loans pledged as collateral Loans Pledged as Collateral FHLB advances, amount prepayable Long-term Federal Home Loan Bank Advances Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Equipment Financing & Leasing Corporation Equipment Financing & Leasing Corporation [Member] Equipment Financing & Leasing Corporation Rubicon Mortgage Advisors, LLC Rubicon Mortgage Advisors, LLC [Member] Rubicon Mortgage Advisors, LLC [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Wholesale banking Wholesale Banking [Member] Wholesale Banking [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Program agreements Program Agreements [Member] Exclusive rights, limted to 15 years, under an agreement, to purchase and service all originations by counterparty Non-compete agreement Noncompete Agreements [Member] Customer base intangibles Customer Based Intangibles [Member] Represents the customer-based intangible assets. Business Acquisition Business Acquisition [Line Items] Percentage of outstanding shares acquired Business Acquisition, Percentage of Voting Interests Acquired Cash paid upon closing Payments to Acquire Businesses, Gross Liability recorded Business Combination, Consideration Transferred, Liabilities Incurred Period in which liability incurred is to be paid (years) Business Combination, Period in Which Liability Incurred is to be Paid (Years) Business Combination, Period in Which Liability Incurred is to be Paid (Years) Liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] EFLC debt assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Assets [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Assets [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Assets [Abstract] Operating lease equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Equipment The amount of operating lease equipment recognized as of the acquisition date. Direct financing leases Business Combination, Acquired Direct Financing Lease Receivable Finite-lived intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Goodwill, net Goodwill Other assets, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets, Net Amount recognized as of the acquisition date for other identifiable assets acquired in excess of (less than) the aggregate other liabilities assumed (includes cash, other assets and other liabilities) Weighted average useful life (Years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Property, Plant and Equipment [Abstract] Land Land Office buildings Buildings and Improvements, Gross Leasehold improvements Leasehold Improvements, Gross Furniture and equipment Furniture And Equipment Gross Furniture represents the long-lived, depreciable assets, commonly used in offices and stores while equipment represents the tangible personal property, nonconsumable in nature, with finite lives used to produce goods and services. Subtotal Property, Plant and Equipment, Gross Less: Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Premises and equipment, net Property, Plant and Equipment, Net Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization [Abstract] Depreciation and amortization expense Depreciation, Depletion and Amortization Operating leases Leases, Operating [Abstract] Lease expense Operating Lease, Expense Sublease income Sublease Income Future minimum rental payments for operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Receivables [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Consumer Real Estate Real Estate Loan [Member] Auto Finance Automobile Loan [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Loans Loan Transactions, Excluding Securitizations [Member] Category of loan transactions, excluding loans transferred to trusts in securitization transactions. Securitizations Securitization Transactions [Member] Category of loan transactions that are securitization transactions. Accounts, Notes, Loans and Financing Receivable Accounts, Notes, Loans and Financing Receivable [Line Items] Consumer real estate non-accrual loans sold Financing Receivable, Significant Sales Servicing Asset at Fair Value, Amount Servicing Asset at Fair Value, Amount Servicing Liability at Fair Value, Amount Servicing Liability at Fair Value, Amount Sales proceeds, net sales proceeds, net The cash inflow associated with the sale of loans receivables arising from the financing of goods and services including transaction fees and other sales related costs. Securitization receivable Securitization Receivable Securitization Receivable Interest-only strips, initial value Interest-only strips, initial value Interest-only strips, initial value Recorded investment in loans sold, including accrued interest Recorded investment in loans sold, including accrued interest Recorded investment in loans sold, including accrued interest Net gains Loans and Leases Receivable, Gain (Loss) on Sales, Net Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 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 Impairment of goodwill and other intangible assets Goodwill and Intangible Asset Impairment Provision (benefit) for deferred income taxes Deferred Income Tax Expense (Benefit) Proceeds from sales of loans and leases held for sale Proceeds From Sale Of Loans And Leases Held For Sale Proceeds From Sale Of Loans And Leases Held For Sale Originations of loans and leases held for sale, net of repayments Payments For Origination And Purchases of Loans and Leases Held for Sale The aggregate amount of cash outflow for loans and leases purchased and created with the intention to resell them in the near future. Gains on sales of assets, net Gain (Loss) on Disposition of Assets 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] Proceeds from sales of securities Proceeds from Sale of 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 securities Payments to Acquire Available-for-sale Securities Redemption of Federal Home Loan Bank stock Proceeds from Sale of Federal Reserve Bank Stock Purchases of Federal Home Loan Bank stock Payments to Acquire Federal Reserve Bank Stock Proceeds from sales of loans and leases Proceeds from Sale of Loans and Leases Held-for-investment Loan and lease originations and purchases, net of principal collected on loans and leases Payments for (Proceeds from) Loans and Leases Acquisition of Equipment Financing & Leasing Corporation, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Proceeds from sales of lease equipment ProceedsFromSaleOfLeasedEquipment ProceedsFromSaleOfLeasedEquipment Purchases of lease equipment Payments to Acquire Equipment on Lease 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 Payment on liabilities related to acquisition and portfolio purchase Payment for Contingent Consideration Liability, Financing Activities Net proceeds from public offering of Series C preferred stock Proceeds from Issuance of Preferred Stock and Preference Stock Redemption of Series A preferred stock Payments for Repurchase of Redeemable Preferred Stock Repurchases of common stock Payments for Repurchase of Common Stock Common shares sold to TCF employee benefit plans Proceeds from Stock Plans 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 Exercise of stock options Proceeds from Stock Options Exercised Net investment by (distribution to) non-controlling interest Proceeds from (Payments to) Noncontrolling Interests 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 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 and leases 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 loans and leases from held for investment to held for sale, net Transfer Of Loans And Leases Held For Sale To From Portfolio Loans And Leases Net Net value of loans and leases held-for sale transferred to (from) loans and leases held in the entity's portfolio in noncash transactions. Statement of Financial Position [Abstract] Assets: Assets [Abstract] Cash and due from banks Investments Other Investments Securities held to maturity Held-to-maturity Securities 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 Receivable, Gross, Commercial, Financial and Agricultural 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 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, Consumer, 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 Other assets Other Assets Total assets Assets Liabilities and Equity: Liabilities and Equity [Abstract] Deposits: Deposits [Abstract] 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 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; 4,007,000 and 4,006,900 issued, respectively Preferred Stock, Value, Issued Common stock, par value $0.01 per share, 280,000,000 shares authorized; 172,158,449 and 171,034,506 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, 489,030 and 42,566 shares, respectively 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 Earnings Per Share [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Retirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Plan Pension Plan [Member] Postretirement Plan Other Postretirement Benefits Plan [Member] Employee Benefit Plans Defined Benefit Plan Disclosure [Line Items] Actual return (loss) on plan assets, net of administrative expenses (as a percent) Defined Benefit Plan Actual Return on Plan Assets Percentage Represents the percentage of difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. Prior service credits expected to be recognized as components of net periodic benefit cost Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year 10-year expected average return on the index consistent with the Pension Plan's current investment strategy Defined Benefit Plan, Weighted Average Return on Plan Assets Represents the weighted-average return of the plan assets, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. Change in net periodic benefit cost as a result of 1% difference in the expected return on plan assets Defined Benefit Plan Effect of One Percentage Point Change in Assumed Expected Return on Plan Assets on Net Periodic Benefit Cost The effect of a one-percentage-point change in the assumed expected return on plan assets on net periodic benefit costs. Average estimated duration of Pension and Postretirement Plans Defined Benefit Plan Average Estimated Duration Represents the average estimated duration of the entity's defined benefit pension plan or other postretirement defined benefit plan. Eligible contributions by employer Defined Benefit Plan Eligible Contributions by Employer Represents the eligible contributions that an employer can make under the plan. Contributions to plan during the year Defined Benefit Plan, Plan Assets, Contributions by Employer Expected contribution Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Equity [Abstract] Schedule of Preferred Shares [Table] Schedule of Preferred Shares [Table] Represents the disclosure of preferred shares issued by the reporting entity. Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series A Preferred Stock Series A Preferred Stock [Member] Series B Preferred Stock Series B Preferred Stock [Member] Series C Preferred Stock Series C Preferred Stock [Member] Public offering of preferred shares Schedule of Preferred Shares [Line Items] Preferred stock, value outstanding Preferred Stock, Value, Outstanding Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Annual rate of dividend (as a percent) Preferred Stock, Dividend Rate, Percentage Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, liquidation preference per share Preferred Stock, Liquidation Preference Per Share Cash dividends paid on preferred stock Preferred stock, depositary shares outstanding Preferred Stock, Depositary Shares Outstanding Aggregate share number for all preferred stock depositary shares outstanding Preferred stock, liquidation preference per depositary share Preferred Stock, Liquidation Preference Per Depositary Share The per depositary share liquidation preference of preferred stock redeemable soley at the option of the issuer that has a preference in involuntary liquidation considerable in excess of the par or stated value of the shares. Preferred stock, value issued Deferred stock issuance costs of Series C preferred stock Deferred Stock Issuance Costs of Series C Preferred Stock The amount of deferred stock issuance costs from the issuance of preferred stock Net proceeds of the offering, after deducting stock issuance costs ProceedsFromIssuanceOfPreferredStockAndPreferenceStockNet Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the sharesholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation, net of offering costs. Series A Preferred stock depositary shares redeemed Depositary Shares Redeemed During Period The amount of preferred stock depositary shares redeemed during the period. Amount for which Series A preferred stock was redeemed Stock Redeemed or Called During Period, Value Deferred stock issuance costs reclassified to retained earnings Deferred Stock Issuance Costs Of Notice To Redeem Preferred Stock The amount of deferred stock issuance costs originally recorded in preferred stock upon issuance of the Series A Preferred Stock. Schedule of long-term borrowings Schedule of Long-term Debt Instruments [Table Text Block] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Net unrealized gains (losses) on securities available for sale and interest-only strips Accumulated Net Unrealized Investment And Interest Only Strip Gain Loss [Domain] Accumulated other comprehensive income (loss) resulting from appreciation (depreciation) in value of securities and interest-only strips attributable to parent. Net unrealized gains (losses) on net investment hedges Accumulated Net Gain Loss From Designated Or Qualifying Net Investment Hedges [Domain] Accumulated Net Gain Loss From Designated Or Qualifying Net Investment Hedges [Domain] Foreign currency translation adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Recognized postretirement prior service cost Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Line Items] Unrealized gains (losses) arising during the period, before tax Other Comprehensive Income (Loss), before Reclassifications, before Tax Reclassification of net (gains) losses from accumulated other comprehensive income (loss), before tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Total other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax Unrealized gains (losses) arising during the period, tax effect Other Comprehensive Income (Loss) before Reclassifications, Tax Reclassification of net (gains) losses from accumulated other comprehensive income (loss), tax effect Reclassification from AOCI, Current Period, Tax Total other comprehensive income (loss), tax effect Other Comprehensive Income (Loss), Tax Unrealized gains (losses) arising during the period, net of tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Reclassification of net (gains) losses from accumulated other comprehensive income (loss), net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Total other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Available for sale securities transferred to held to maturity securities value 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 gain (loss) transfers from available for sale to held to maturity 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 Unrealized Holding Gain (Loss) Transfers from Available for Sale to Held to Maturity Retained in Accumulated Other Comprehensive Income 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] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] 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 (in shares) Shares, Issued Balance Change in accounting principle New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Net income Other comprehensive income (loss), net of tax Net investment by (distribution to) non-controlling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Public offering of Series C preferred stock (in shares) Stock Issued During Period, Shares, New Issues Public offering of Series C preferred stock Stock Issued During Period, Value, New Issues Redemption of Series A preferred stock (in shares) Stock Redeemed or Called During Period, Shares Redemption of Series A preferred stock Repurchase of 446,464 shares of common stock (in shares) Treasury Stock, Shares, Acquired Repurchase of 446,464 shares of common stock Treasury Stock, Value, Acquired, Cost Method Dividends on preferred stock Dividends, Preferred Stock, Cash Dividends on common stock Dividends, Common Stock, Cash Common shares purchased by TCF employee benefit plans (in shares) Stock Issued During Period, Shares, Employee Benefit Plan Common shares purchased by TCF employee benefit plans Stock Issued During Period, Value, Employee Benefit Plan Stock compensation plans, net of tax (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock compensation plans, net of tax Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures 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 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] Consumer real estate Residential Portfolio Segment [Member] Commercial Commercial Portfolio Segment [Member] Leasing and equipment finance Leasing and Equipment Finance Portfolio Segment [Member] Represents member for leasing and equipment finance portfolios. Inventory finance Inventory Financing Portfolio Segment [Member] Represents member for inventory finance portfolios. Auto finance Other Other Financing Portfolio Segment [Member] Represents member for other finance portfolios. Consumer real estate and commercial Consumer real estate and commercial loans [Member] Consumer real estate and commercial loans [Member] First mortgage lien First Mortgage [Member] Junior lien Second Mortgage [Member] Loan Modifications for Borrowers with Financial Difficulties Financing Receivable, Modifications [Line Items] 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. Non-accrual TDR Loans Non-accrual Troubled Debt Restructurings The amount of the outstanding recorded investment related to non-accrual financing receivables that have been modified by troubled debt restructurings. Total TDR Loans Financing Receivable, Modifications, Recorded Investment Allowance on accruing TDR loans Financing Receivable, Modifications, Allowance for Credit Losses Represent reserves for losses on loan TDRs outstanding as of the balance sheet date. Allowance on accruing TDR loans (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. 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. Maximum period past due to be considered accruing status for consumer real estate TDR loans Maximum Period Past Due for Accruing Status for Consumer Real Estate Troubled Debt Restructuring Loans Consumer real estate TDR loans generally remain on accruing status following modification if they are less than 90 days past due and payment in full under the modified terms of the loan is expected based on a current credit evaluation and historical payment performance. 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. Unfunded commitments to loans classified as TDRs Loans and Leases Receivable, Impaired, Commitment to Lend Unrecognized interest income on accruing TDR loans 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. Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Other Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] 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] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Consumer Real Estate Leasing and Equipment Finance Inventory Finance 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(1) Allowance for Loan and Lease Losses, Adjustments, Other Balance, end of period Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] 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] Mortgage-backed securities, 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 held for sale Loans Held-For-Sale [Member] Loans Held-For-Sale [Member] Interest only strip Interest-Only-Strip [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] Assets, Fair value carrying amount Assets, Fair Value Disclosure Liabilities, Fair value carrying amount Financial and Nonfinancial Liabilities, Fair Value Disclosure Loans Loans Receivable, Fair Value Disclosure Other real estate owned Other Real Estate Owned, Fair value disclosure Represents the fair value of Other Real Estate Owned Repossessed and returned assets Repossessed and Returned Equipment, Fair Value Disclosure Represents the fair value of repossessed and returned equipment. Fair Value, Adjustment Disclosure Fair Value, Adjustment Disclosure [Abstract] Transfers between fair value levels Fair Value, Assets or Liabilities, Transfers Between Levels, Amount Amount of transfers of assets or liabilities measured on a recurring basis within the fair value hierarchy. Commitments and Contingencies Disclosure [Abstract] Litigation Contingencies Legal Matters and Contingencies [Text Block] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] The TCF 401K Plan The TCF 401K Plan [Member] The TCF 401K Plan [Member] Service period range equal to one or more years Service Period Range Equal To Or More Than One Year [Member] Service Period Range Equal To Or More Than One Year [Member] Service period range of one to four years Service Period Range One to Four Years [Member] Represents the service period range from one through four years. Service period range of five to nine years Service Period Range Five to Nine Years [Member] Represents the service period range from five through nine years. Service period range equal to or more than 10 years Service Period Range Equal to or More than Ten Years [Member] Represents the service period of ten or more years. TCF Common Stock TCF 401K Plan Defined Contribution Plan Disclosure [Line Items] Maximum employee contribution as a percent of covered compensation Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Employer matching contribution rate per dollar The 401K Plan, Employer Matching Contribution Per Dollar The 401K Plan, Employer Matching Contribution Per Dollar Requisite years of service The 401K Plan, Matching Component Requisite Service Period The 401K Plan, Matching Component Requisite Service Period Maximum company contribution as a percent of covered compensation Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Matching contributions vesting period The 401K Plan Employer Matching Contribution Vesting Period The 401K Plan Employer Matching Contribution Vesting Period Fair value of assets in the plan Deferred Compensation Plan, Fair Value of Plan Assets Represents the total fair value of assets under a deferred compensation arrangement. Contributions to the 401K plan Defined Contribution Plan, Cost Investments Investment [Text Block] Restricted Retained Earnings Retained Earnings Note Disclosure [Abstract] Undistributed earnings of TCF's bank subsidiary Undistributed Earnings of Subsidiaries Represents the undistributed earnings of subsidiary of the entity for which no provision for federal income taxes has been made and is generally not available for payment of cash dividends or other distributions to shareholders. Amount of provision for federal income taxes related to undistributed earnings of TCF's bank subsidiary Retained Earnings Provision for Federal Income Taxes Represents the amount of provision for federal income taxes related to appropriated earnings included in retained earnings. Treasury Stock and Other Class of Stock Disclosures [Abstract] Treasury stock, at cost Treasury Stock, Value Shares held in trust for deferred compensation plans, at cost Common Stock Issued, Employee Trust, Deferred Total Repurchase of common stock (in shares) Average cost of treasury stock repurchased (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Aggregate value of shares remaining in the stock repurchase program authorized by the Board of Directors Stock Repurchase Program, Remaining Authorized Repurchase Amount Interest-only strips Interest Only Strips, Fair Value Disclosure Represents the total fair market value of interest-only strips. 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. Financial Instruments with Off-Balance Sheet Risk Consumer Real Estate and Other Consumer Real Estate and Other Receivable [Member] Class of financing receivables related to consumer real estate and other receivables. Commercial Commercial Receivables [Member] Class of financing receivables related to commercial real estate and commercial business. Leasing and equipment finance Leasing and Equipment Finance Receivable Other [Member] Other loans and leases related to leasing and equipment finance. Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Standby letters of credit and guarantees on industrial revenue bonds Standby Letters of Credit [Member] Financial instruments with off-balance sheet risk Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Commitments to extend credit Unused Commitments to Extend Credit Standby letters of credit and guarantees on industrial revenue bonds Guarantor Obligations, Maximum Exposure, Undiscounted Financial Instruments with Off-Balance Sheet Risk Amount Financial Instruments with Off-Balance Sheet Risk Amount Financial Instruments with off-balance sheet risk amount. Joint Venture Equity Method Investments and Joint Ventures [Abstract] Ownership interest in Joint Venture, by TCF (as a percent) Ownership Interest in Joint Venture Percentage by Parent This element represents the percentage of ownership in Red Iron Acceptance, LLC ("Red Iron") by TCF. Ownership interest in Joint Venture, by Toro Company (as a percent) Ownership Interest in Joint Venture Percentage by Noncontrolling Owners This element represents the percentage of ownership in Red Iron Acceptance, LLC ("Red Iron") by Toro Company. Warrants Warrants and Rights Note Disclosure [Abstract] Outstanding warrants to purchase common stock (in shares) Class of Warrant or Right, Outstanding Warrants exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights 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] Securities sold under repurchase agreements Securities Sold under Agreements to Repurchase [Member] Line of Credit - TCF Commercial Finance Canada, Inc. Line of Credit [Member] Federal funds purchased Federal Funds Purchased [Member] Short-term Borrowings Short-term Debt [Line Items] Period end balance for 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 Accounting Policies [Abstract] Critical Accounting Estimates Use of Estimates, Policy [Policy Text Block] Allowance for Loan and Lease Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Securities Held to Maturity Marketable Securities, Held-to-maturity Securities, Policy [Policy Text Block] Securities Available for Sale Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block] Loans and Leases Held for Sale Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Loans and Leases Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block] Non-accrual Loans and Leases Finance, Loan and Lease Receivables, Held-for-investment, Allowance and Nonperforming Loans, Nonperforming Loans Policy [Policy Text Block] Lease Financing Loans and Leases Receivable, Lease Financing, Policy [Policy Text Block] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Other Real Estate Owned and Repossessed and Returned Assets Real Estate Held for Development and Sale, Policy [Policy Text Block] Investments in Affordable Housing Limited Liability Entities Equity and Cost Method Investments, Policy [Policy Text Block] Interest-only Strips Interest Only Strips [Policy Text Block] Describes the entity's accounting policy for interest only strips. Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Derivatives Derivatives, Policy [Policy Text Block] Stock-based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] New Accounting Pronouncements Adopted New Accounting Pronouncements, Policy [Policy Text Block] Allowance for loan and lease losses: Financing Receivable, Allowance for Credit Loss, Additional Information [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 Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net Schedule of funded statuses of the Pension Plan and the Postretirement Plan Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Pension Plan investments measured at fair value on a recurring basis Schedule of Allocation of Plan Assets [Table Text Block] Schedule of changes recognized in accumulated other comprehensive income (loss) attributable to the Postretirement Plan Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Tabular disclosure of the net gain (loss) and net prior service cost or credit and transition assets (obligations), as well as minimum pension liability recognized in accumulated other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of accumulated other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. Schedule of net periodic benefit cost included in compensation and employee benefits expense for the Pension Plan and Postretirement Plan Schedule of Net Benefit Costs [Table Text Block] Schedule of assumptions used to determine the estimated benefit plan obligation for the Pension Plan and Postretirement Plan Schedule of Assumptions Used [Table Text Block] Schedule of effect of 1% change in assumed health care cost trend rates Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] Schedule of expected benefit payments used to determine projected benefit obligation Schedule of Expected Benefit Payments [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Awards and Restricted Stock Units Restricted Stock Awards and Restricted Stock Units [Member] Restricted Stock Awards and Restricted Stock Units [Member] Restricted Stock Awards (RSAs) Restricted Stock [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Stock Options Employee Stock Option [Member] Minimum Maximum Share-based compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Restricted stock awards, 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 Awards, 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 Awards, 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 Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 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, Weighted-Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Weighted- Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Stock Options, 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, Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises 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 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 Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Consumer Real Estate Loans to Customers in Bankruptcy Financing Receivable, Recorded Investment, Past Due [Line Items] 0-59 days delinquent and accruing Financing Receivable, Recorded Investment, Current to 59 Days, to Customers in Bankruptcy Financing Receivable, Recorded Investment, Current to 59 Days, to Customers in Bankruptcy Non-accrual Financing Receivable, Recorded Investment, Nonaccrual Status, to Customers in Bankruptcy Financing Receivable, Recorded Investment, Nonaccrual Status, to Customers in Bankruptcy Total consumer real estate loans to customers in bankruptcy Financing Receivable, Recorded Investment, Total Loans to Customer in Bankruptcy Financing Receivable, Recorded Investment, Total Loans to Customer in Bankruptcy Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Segment Reporting [Abstract] Reportable segments, including a reconciliation of consolidated totals Schedule of Segment Reporting Information, by Segment [Table Text Block] Short-term Borrowings Short-term Debt [Text Block] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Income Statement [Table] Condensed Income Statement [Table] TCF Financial Corporation Parent Company [Member] Condensed Statements of Income Condensed Income Statements, Captions [Line Items] Interest income Interest Income, Operating Dividends from TCF Bank Dividend Income from Subsidiary Represents the earned dividend income from the subsidiary of the entity. Affiliate service fees Revenue from Related Parties Other Noninterest Income, Other Operating Income Total non-interest Income Noninterest Income, Other Compensation and employee benefits Labor and Related Expense Occupancy and equipment Occupancy, Net Other Other Noninterest Expense Total non-interest expense Noninterest Expense Income before income tax expense (benefit) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax benefit Income Tax Expense (Benefit) Income before equity in undistributed earnings of bank subsidiary Income (Loss) from Continuing Operations before Income (Loss) from Equity Method Investments Represents the sum of operating profit and nonoperating income or expense before equity method investments, extraordinary items, and noncontrolling interest. Equity in undistributed earnings of bank subsidiary Income (Loss) from Equity Method Investments Net income Net Income (Loss) Attributable to Parent Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Impact of preferred stock redemption Preferred Stock Dividends and Other Adjustments Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Omnibus Incentive Plan tcb_Omnibus Incentive Plan [Member] tcb_Omnibus Incentive Plan [Member] Incentive Stock Program tcb_Incentive Stock Program [Member] tcb_Incentive Stock Program Shares reserved for issuance under the program (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Outstanding number of shares to vest only if certain return on asset goals, and service conditions are achieved (in shares) 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. Share-based award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Unrecognized stock compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average amortization Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Restricted stock granted, not yet vested (in shares) Restricted Stock Units, Grants In Period The number of RSU grants made to date at the period end. Award performance period for RSUs Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period Period over which performance goals are required to be met in order for the awards to vest. Peer group, asset threshold Share-based Compensation Arrangement by Share-based Payment Award, Peer Group, Asset Threshold Share-based Compensation Arrangement by Share-based Payment Award, Peer Group, Asset Threshold Restricted stock units, maximum multiplier Share-based Compensation Arrangement by Share-based Payment Award, Maximum Multiplier Percentage Share-based Compensation Arrangement by Share-based Payment Award, Maximum Multiplier Restricted stock units vested (in shares) Remaining performance period for RSUs Share-based Compensation Arrangement by Share-based Payment Award, Remaining Performance Period The remaining period of time in which performance goals must be met in order for the awards to vest. Compensation expense Allocated Share-based Compensation Expense Tax benefit recognized for stock compensation expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Stock options expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Valuation assumptions for stock option plans Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Weighted-average volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected term (years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk-free interest rate, minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free interest rate, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Income Tax Disclosure [Abstract] Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total current Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Total deferred Total Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract] Federal, Total Federal Income Tax Expense (Benefit), Continuing Operations State, Total State and Local Income Tax Expense (Benefit), Continuing Operations Foreign, Total Foreign Income Tax Expense (Benefit), Continuing Operations Total Reconciliation of effective income tax rate from the federal income tax rate Effective Income Tax Rate Reconciliation, Percent [Abstract] Federal income tax rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Increase (decrease) resulting from: Increase (Decrease) in Income Tax Expense [Abstract] Tax Reform effects, net (as a percent) Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Nondeductible goodwill impairment effect (as a percent) Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent State income tax, net of federal income tax (as a percent) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Tax-exempt income (as a percent) Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Non-controlling interest tax effect (as a percent) Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent State tax settlements, net of federal tax (as a percent) Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Percent Stock Compensation (as a percent) Effective Income Tax Rate Reconciliation, Effect of Adoption of ASU 2016-09 Effective Income Tax Rate Reconciliation, Effect of Adoption of ASU 2016-09 Investments in affordable housing limited liability entities (as a percent) Effective Income Tax Rate Reconciliation Investments in Affordable Housing Effective Income Tax Rate Reconciliation Investments in Affordable Housing Foreign tax effects (as a percent) Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Other, net (as a percent) Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent 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] 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 segments Operating Segments [Member] Consumer banking Consumer Banking [Member] Consumer Banking Enterprise services Enterprise Services [Member] Enterprise Services [Member] Segment Reporting Information Segment Reporting Information [Line Items] Net interest income (expense) Interest Income (Expense), Net Non-interest income Noninterest Income Non-interest expense Income tax expense (benefit) Income after income tax expense (benefit) Income attributable to non-controlling interest Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Nonredeemable Preferred stock dividends Impact of preferred stock redemption 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 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 future minimum lease payments receivable Schedule of Future Minimum Lease Payments Receivable [Table Text Block] Tabular disclosure of the annual future minimum lease payments receivable in aggregate and for each of the five succeeding fiscal years for direct financing, sales-type leases and operating leases. Changes in accretable yield and carrying value of PCI loans Changes In Carrying Value of Purchase Credit Impaired Loans [Table Text Block] Changes in the carrying value of purchase credit impaired loans. Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate swap Interest Rate Swap [Member] Interest rate contracts Interest Rate Contract [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Net Investment Hedges Net Investment Hedging [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedges Designated as Hedging Instrument [Member] Not Designated as Hedges Not Designated as Hedging Instrument [Member] Basis of Presentation Valuation and Qualifying Accounts Disclosure [Line Items] Allowance for Loan and Lease Losses Number of days past due to be considered to charge off consumer real estate loans Number of days past due to be considered to charge off consumer real estate loans Represents the number of days past due to be considered to charge off consumer real estate loans. Number of days past due to be considered to charge off auto finance loans in full Number of days past due to be considered to charge off auto finance loans in full Represents the number of days past due to be considered to charge off auto finance loans in full. Number of days from date of overdraft to report net losses on uncollectible overdrafts as net charge offs in allowance for loan and lease losses Number of Days from Date of Overdraft to Report Net Losses on Uncollectible Overdrafts as Net Charge Offs in Allowance for Loan and Lease Losses Represents the number of days from the date of overdraft considered to report net losses on uncollectible overdrafts as net charge-offs in the allowance for loan and lease losses. Number of days past due to be considered to charge off uncollectible overdrafts Number of days past due to be considered to charge off net losses on uncollectible overdrafts Represents the number of days past due for which net losses on uncollectible overdrafts are to be reported as net charge-offs. Non-accrual Loans and Leases Loans and Leases Receivable Disclosure [Abstract] Number of days interest and principal are past due for loans and leases to be placed on nonaccrual status Past Due of Interest and Principal for Loans and leases to be Placed on Nonaccrual Status Represents the period for which the loans and leases past due are placed on non-accrual status. Number of days interest and principal for third party consumer first mortgage lien are past due to be placed on nonaccrual status Past Due of Interest and Principal for Third Party Consumer First Mortgage Lien to be Placed on Nonaccrual Status Represents the 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. Sustained repayment performance period through which loans and leases are reported as nonaccrual loans and leases Sustained Repayment Performance Period Until when Loans and Leases are to be Reported as Nonaccrual Loans Represents the sustained repayment performance period until which loans and leases are considered as non-accrual loans. Sustained repayment performance period through which income on loans and leases is recognized on cash basis Sustained Repayment Performance Period Until when Income on Loans and Leases are Recognized on Cash Basis Represents the sustained repayment performance period until when income on loans and leases are to be recognized on a cash basis. Number of days delinquent through which income on loans and leases is recognized on cash basis Number of Days Delinquent Until when Income on Loans and Leases are Recognized on Cash Basis Represents the number of days delinquent until when income on loans and leases are to be recognized on a cash basis. Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative liability, notional amount Derivative Liability, Notional Amount Derivative, fixed interest rate Derivative, Fixed Interest Rate Maximum remaining maturity of foreign currency derivatives Maximum Remaining Maturity of Foreign Currency Derivatives Derivative, term of contract Derivative, Term of Contract Derivative, remaining maturity Derivative, Remaining Maturity Reconciliation of the change in unrecognized tax benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at the beginning of the period Unrecognized Tax Benefits Increases for tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Increases for tax positions related to prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Decreases for tax positions related to prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Settlements with taxing authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Decreases related to lapses of applicable statutes of limitation Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Balance at the end of the period Significant components of the Company's deferred tax assets and deferred tax liabilities Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Deferred Tax Assets, Net [Abstract] Allowance for loan and lease losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Stock compensation and deferred compensation plans Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Net operating losses Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Securities available for sale Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross Accrued expense Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Other Deferred Tax Assets, Other Deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities Deferred Tax Liabilities, Gross [Abstract] Lease financing Deferred Tax Liabilities, Leasing Arrangements Premises and equipment Deferred Tax Liabilities, Property, Plant and Equipment Loan fees and discounts Deferred Tax Liabilities, Financing Arrangements Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses Goodwill and other intangibles Deferred Tax Liabilities, Goodwill and Intangible Assets Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax liabilities Deferred Tax Liabilities, Net Fair Value Disclosures Fair Value Disclosures [Text Block] Other Income and Expenses [Abstract] Other Non-Interest Expense Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Loans and Leases Financing Receivables [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 Loans held for sale 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. 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 Marketable Securities, Realized Gain (Loss) Total non-interest income Non-interest expense: Noninterest Expense [Abstract] 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. Income tax expense (benefit) Net income attributable to TCF Financial Corporation Earnings per common share: Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Fair Value Hedging Fair Value Hedging [Member] Derivatives designated as hedges Derivatives not designated as hedges Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Non-interest income Noninterest Income [Member] Primary financial statement caption in which reported facts about noninterest income have been included. Non-interest expense Noninterest Expense [Member] Primary financial statement caption in which reported facts about noninterest expense have been included. Gains on sales of consumer real estate loans, net Gain (Loss) on Sales of Consumer Loans [Member] Gain (Loss) on Sales of Consumer Loans [Member] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis]