Goodwill and Intangible Assets Disclosure [Abstract] Schedule of goodwill and other intangible assets Schedule of Intangible Assets and Goodwill [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Information Related to Restricted Stock Awards Schedule of Information Related to Restricted Stock Awards [Table Text Block] Tabular disclosure of information related to restricted stock awards. Schedule of Compensation Cost for Restricted Stock Units and Restricted Stock Awards Schedule of Compensation Costs for Restricted Stock Units and Restricted Stock Awards [Table Text Block] [Table Text Block] for Tabular disclosure of the amount of total share-based compensation costs related to Restricted Stock Units and Restricted Stock Awards and any related tax benefits Schedule of Valuation Assumptions for Stock Option Plans Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Restricted Stock Award and Stock Option Transactions under the Company Financial Incentive Stock Program Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] 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] Public offering of preferred shares Schedule of Preferred Shares [Line Items] Shares, Issued Shares, Issued Par value per share Depositary Shares Par or Stated Value Per Share Face amount or stated value per share of depositary shares. 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 Cash dividends paid on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Deposits [Abstract] Weighted-average Rate Interest Bearing Deposit Liabilities Weighted Average Rate [Abstract] Interest bearing Interest Bearing Checking Deposits Weighted Average Rate Represents the weighted average interest rate for interest bearing checking accounts. Total checking Total Checking Deposits Weighted Average Rate Represents the weighted average interest rate for total checking accounts. Savings Interest Bearing Deposits Savings Deposits Weighted Average Rate Represents the weighted average interest rate for interest bearing savings deposit accounts. Money market Interest Bearing Deposits Money Market Deposits Weighted Average Rate Represents the weighted average interest rate for interest bearing money market deposit accounts. Certificates of deposit Interest Bearing Certificates of Deposits Weighted Average Rate Represents the weighted average interest rate for interest bearing certificate of deposit liabilities. Total deposits Interest Bearing Deposits Weighted Average Rate Represents the weighted average interest rate for all interest bearing deposit liabilities. Deposits Deposits, by Type [Abstract] Non-interest bearing Noninterest Bearing Deposit Checking Amount of non-interest bearing checking deposit liabilities. Interest bearing Interest Bearing Deposit Checking Amount of interest bearing checking deposit liabilities. Total checking Demand Deposit Accounts Savings Deposits, Savings Deposits Money market Deposits, Money Market Deposits Total Time Deposits Total deposits Deposits % of Total Percentage of Interest Bearing Deposit Liabilities to Deposit Liabilities [Abstract] Non-interest bearing Percentage of Non Interest Bearing Deposits to Total Deposits Represents the percentage of non-interest bearing checking demand deposit liabilities to total deposit liabilities. Interest bearing Percentage of Interest Bearing Deposits to Total Deposits Percentage of interest bearing checking demand deposit liabilities to total deposit liabilities. Total checking Percentage of Total Checking Deposits to Total Deposits Percentage of interest bearing demand deposit liabilities to total deposit liabilities. Savings Percentage of Savings Deposits to Total Deposits Percentage of interest bearing savings deposit liabilities to total deposit liabilities. Money market Percentage of Money Market Deposits to Total Deposits Percentage of interest bearing money market demand account deposit liabilities to total deposit liabilities. Certificates of deposit Percentage of Deposits, Certificates of Deposit, to Total Deposits Percentage of interest bearing certificates of deposit liabilities to total deposit liabilities. Total deposits Percentage of Total Deposits to Total Deposits Percentage of total deposit liabilities. Annual Maturities for Certificates of Deposit Time Deposits, Fiscal Year Maturity [Abstract] 2017 Time Deposit Maturities, Next Twelve Months 2018 Time Deposit Maturities, Year Two 2019 Time Deposit Maturities, Year Three 2020 Time Deposit Maturities, Year Four 2021 Time Deposit Maturities, Year Five Thereafter Time Deposit Maturities, after Year Five Time Deposits, at or above FDIC insurance limit Time Deposits, at or Above FDIC Insurance Limit 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] 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 Securities held to maturity Held-to-maturity Securities Loans Loans Receivable, Fair Value Disclosure Other 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. 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] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Subordinated bank notes Subordinated Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Maturity Year 2025 Maturity Year 2025 [Member] Maturity Year 2025 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Debt instrument, face amount Debt Instrument, Face Amount 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] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Omnibus Incentive Plan tcb_Omnibus Incentive Plan [Member] tcb_Omnibus Incentive Plan [Member] Incentive Stock Program tcb_Incentive Stock Program [Member] tcb_Incentive Stock Program 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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Share-based compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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 (years) 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) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number 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 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, Exercise Price Range Share Based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Roll Forward] Exercise price, Outstanding at the beginning (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Exercise Price Exercise price, Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price Exercise price, Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Exercise Price Exercise price, Forfeited/canceled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price Exercise price, Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Exercise Price Exercise price, Outstanding at the end (in dollars per share) 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 (in years) 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 Exercise price, Stock options exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Exercise Price Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Debt Disclosure [Abstract] Long-term Borrowings Long-term Debt [Text Block] 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] Leasing and equipment finance Leasing and Equipment Finance Receivable [Member] Represents member for leasing and equipment finance portfolios. 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 Loans Real Estate Loan [Member] Auto finance Automobile Loan [Member] Class of Financing Receivable, Type of Borrower [Axis] Class of Financing Receivable, Type of Borrower [Axis] Class of Financing Receivable, Type of Borrower [Domain] Class of Financing Receivable, Type of Borrower [Domain] Consumer Borrower Consumer Borrower [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] 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. Lease receivable Lease Receivable, Net Lease Receivable, Net Loans receivable Loans Receivable, Net 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 Deferred Income Tax Expense (Benefit) 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 Income Tax Expense (Benefit) 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] 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 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 Other Income and Expenses [Abstract] Other Expense Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Accounting Policies [Abstract] Consolidation Consolidation, Policy [Policy Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] 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] Lease Financing Loans and Leases Receivable, Lease Financing, 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] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Other Real Estate Owned and Repossessed and Returned Equipment 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. 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] 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] Maximum Minimum 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. Expected actuarial return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Actual gain (loss) on plan assets Defined Benefit Plan, Actual Return on Plan Assets Prior service credits expected to be recognized as components of net periodic benefit cost Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) Weighted-average return of the indexes consistent with the Plan's current investment strategy, net of administrative expenses (as a percent) 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. Expected contribution Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year Contributions to plan during the year Defined Benefit Plan, Contributions by Employer Balances of assets and liabilities measured at fair value on a recurring and non-recurring basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Schedule of reconciliation of the net derivative assets and liabilities measured at fair value on a recurring basis Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of reconciliation of the assets measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair value, option, quantitative disclosures Fair Value, Option, Quantitative Disclosures [Table Text Block] Fair value of assets and liabilities, including hierarchy level Fair Value, by Balance Sheet Grouping [Table Text Block] 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 Two Through Five, Amortized Cost Basis 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 Two Through Five, Fair Value Due in 5-10 years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Due after 10 years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value Fair Value Available-for-sale Securities Securities held to maturity: Held-to-maturity Securities, Debt Maturities [Abstract] Amortized cost, securities held to maturity Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract] Due in one year or less Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Due in 1-5 years Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Due in 5-10 years Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Due after 10 years Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost Amortized Cost 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 Two Through Five, Fair Value Due in 5-10 years Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Due after 10 Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Fair Value Fair Value Held-to-maturity Securities, Fair Value Schedule of The 401K Plan [Table] Schedule of The 401K Plan [Table] Schedule of The 401K Plan [Table] Defined Contribution Plan Name [Axis] Defined Contribution Plan Name [Axis] Defined Contribution Plan Name [Domain] Defined Contribution Plan Name [Domain] 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] One through four years Service Period Range One to Four Years [Member] Represents the service period range from one through four years. Five through nine years Service Period Range Five to Nine Years [Member] Represents the service period range from five through nine years. 10 or more years Service Period Range Equal to or More than Ten Years [Member] Represents the service period of ten or more years. TCF Common Stock Common Stock [Member] Schedule of The 401K Plan Schedule of The 401K Plan [Line Items] [Line Items] for Schedule of The 401K Plan [Table] Participants' contribution as a percentage of covered compensation Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Employer matching contribution per dollar The 401K Plan, Employer Matching Contribution Per Dollar The 401K Plan, Employer Matching Contribution Per Dollar Years of service The 401K Plan, Matching Component Requisite Service Period The 401K Plan, Matching Component Requisite Service Period Maximum matching contribution by employer as percentage of covered compensation Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer's contribution, vesting period The 401K Plan Employer Matching Contribution Vesting Period The 401K Plan Employer Matching Contribution Vesting Period Fair value of the assets in the plan The 401K Plan, Fair Value of Plan Assets The 401K Plan, Fair Value of Plan Assets Employer contribution to the plan Defined Contribution Plan, Cost Recognized Stock Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Statement of Comprehensive Income [Abstract] Net income attributable to TCF Financial Corporation Net Income (Loss) Attributable to Parent Other comprehensive income (loss), net of tax: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Net unrealized gains (losses) on securities available for sale and interest-only strips Other Comprehensive Income, Unrealized Holding Gain (Loss) On Securities And Interest Only Strips Arising During Period, Net Of Tax Other Comprehensive Income, Unrealized Holding Gain (Loss) On Securities And Interest Only Strips Arising During Period, Net Of Tax Net unrealized gains (losses) on net investment hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Recognized postretirement prior service cost Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax Total other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Property, Plant and Equipment [Abstract] Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Fair Value Disclosures Fair Value Disclosures [Text Block] Allowance for Loan and Lease Losses and Credit Quality Information 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. First mortgage lien First Mortgage [Member] 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 Inventory Finance Inventory Financing Receivable [Member] Represents member for inventory finance portfolios. 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 Schedule of Finite Lived and Indefinite Lived Intangible Assets [Table] Schedule of Finite Lived and Indefinite Lived Intangible Assets [Table] Disclosure of the carrying value of amortizable and unamortizable intangible assets, including goodwill. 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] Deposit base intangibles Deposit Based Intangibles [Member] Represents the deposit-based intangible assets. Customer base intangibles Customer Based Intangibles [Member] Represents the customer-based intangible assets. Non-compete agreement Noncompete Agreements [Member] Tradename Trade Names [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Consumer banking Consumer Banking [Member] Consumer Banking Wholesale banking Wholesale Banking [Member] Wholesale Banking [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating segments Operating Segments [Member] Goodwill and other intangible assets Finite Lived and Indefinite Lived Intangible Assets [Line Items] Amortization expenses Amortization of Intangible Assets Impairment of goodwill Goodwill, Impairment Loss Impairment of intangible assets Impairment of Intangible Assets (Excluding Goodwill) Amortizable intangible assets: Finite-Lived Intangible Assets, Net [Abstract] Gross Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Amount Finite-Lived Intangible Assets, Net Goodwill Goodwill [Roll Forward] Goodwill Goodwill Estimated amortization expense for intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2017 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Five New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Long-term borrowings Long-term Debt [Member] Other assets Other Assets [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2015-03 Accounting Standards Update 2015-03 [Member] New Accounting Pronoucements or Change in Accounting Principle New Accounting Pronouncements or Change in Accounting Principle [Line Items] Reclassification of unamortized debt issuance costs Unamortized Debt Issuance Expense Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land Land [Member] Office buildings Building [Member] Leasehold improvements Leasehold Improvements [Member] Furniture and equipment Furniture and Equipment [Member] 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. Premises and equipment Property, Plant and Equipment [Line Items] Subtotal Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, Plant 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] Net lease expense Operating Leases, Rent Expense, Net Future minimum rental payments for operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2017 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2018 Operating Leases, Future Minimum Payments, Due in Two Years 2019 Operating Leases, Future Minimum Payments, Due in Three Years 2020 Operating Leases, Future Minimum Payments, Due in Four Years 2021 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due 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 and fair value of securities available for sale and securities held to maturity by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Interest income attributable to securities available for sale Interest Income On Securities Available For Sale By Taxable Status [Table Text Block] Tabular disclosure of interest income attributable to securities available for sale by taxable status. Investment Holdings [Table] Investment Holdings [Table] Securities available for sale and securities held to maturity Investment Holdings [Line Items] Gross unrealized losses and fair value of securities available for sale that is in a loss position Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Less than 12 months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or more, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or more, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Total, Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Gross unrealized losses and fair value of securities held to maturity that is in a loss position Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] Less than 12 months, Fair Value Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months, Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or more, Fair Value Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or more, Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total, fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value Total, Unrealized Losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss Cash and Cash Equivalents [Abstract] Cash and Due from Banks Cash and Cash Equivalents Disclosure [Text Block] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Income Statement [Table] Condensed Income Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] TCF Financial Corporation Parent Company [Member] Condensed Statements of (Loss) 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 Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax benefit Income before equity in undistributed earnings of 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 Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic 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. Segment Reporting [Abstract] Business Segments Segment Reporting Disclosure [Text Block] Measurement of fair value on a recurring basis Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Fixed income mutual funds Fixed Income Funds [Member] Money market mutual funds Money Market Funds [Member] Cash Cash and Cash Equivalents [Member] Mortgage-backed securities Collateralized Mortgage Backed Securities [Member] Collective investment fund Collective Investment Fund [Member] Collective Investment Fund [Member] Fair value of plan assets Defined Benefit Plan, Fair Value of Plan Assets Defined Benefit Plan Changes Recognized in Accumulated Other Comprehensive Loss [Roll Forward] Defined Benefit Plan Changes Recognized in Accumulated Other Comprehensive Loss [Roll Forward] Accumulated other comprehensive income (loss) before tax, beginning of period Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax Amortization of prior service credit (recognized in net periodic benefit cost) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Accumulated other comprehensive income (loss) before tax, end of period 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. 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 Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Commercial Loans Commercial Financing Receivable Member [Domain] Commercial Financing Receivable Member [Domain] Consumer Borrower Commercial Borrower Commercial Borrower [Member] Mortgage Loans on Real Estate, Description, Loan Category [Axis] Mortgage Loans on Real Estate, Description, Loan Category [Axis] Mortgage Loans on Real Estate, Loan Category [Domain] Mortgage Loans on Real Estate, Loan Category [Domain] Loan Modifications for Borrowers with Financial Difficulties Financing Receivable, Modifications [Line Items] Minimum period for loans to be delinquent to be considered in default Minimum Period of Loans Delinquent to be Considered in Default Represents the minimum period for loans to be delinquent to be considered in default. Loan Balance Financing Receivable, Modifications, Subsequent Default, Recorded Investment Equity Stockholders' Equity Note Disclosure [Text Block] Treasury stock and other Class of Treasury Stock [Table Text Block] Deposits Deposit Liabilities Disclosures [Text Block] Information about long-term borrowings Schedule of Long-term Debt Instruments [Table Text Block] Loan and lease processing Loan and Lease Expense Represents the amount of expenses incurred during the period for loan and lease expense. Advertising and marketing Marketing and Advertising Expense Professional fees Professional Fees FDIC insurance Federal Deposit Insurance Corporation Premium Expense Card processing and issuance cost Card Processing and Issuance Expenses This element represents the amount of expenses incurred during the period for card processing and issuance. Outside processing Outside Processing Expenses This element represents the amount of expenses incurred during the period for outside processing. Other Other Noninterest Expense, Other This element represents the amount of other non-interest expenses incurred in the period not separately presented in the statement of income or in the other expense note. Total other expense Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Reportable segments, including a reconciliation of consolidated totals Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Compliance with Regulatory Capital Requirements under Banking Regulations Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Tier 1 leverage capital Tier One Leverage Capital [Abstract] Tier 1 risk-based capital Tier One Risk Based Capital [Abstract] Total risk-based capital Total Risk Based Capital [Abstract] Tier 1 leverage ratio Leverage Ratios [Abstract] Tier 1 risk-based capital ratio Risk Based Ratios [Abstract] Total risk-based capital ratio Total Risk Based Ratios [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Estimated Fair Value Estimate of Fair Value Measurement [Member] Fair Value, 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: Receivables, Fair Value Disclosure [Abstract] Consumer real estate Loans and Leases Receivable, Gross, Consumer, Real Estate Commercial real estate Loans Receivable, Gross, Commercial, Real Estate 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. Equipment finance Loans Receivable, Equipment Financing Represents the fair value of commercial loans, which are issued for equipment financing. 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 Allowance for loan losses Loans and Leases Receivable, Allowance Securitization receivable Receivables, Fair Value Disclosure 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 Liabilities Fair Value Disclosure 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 TDR loans Financing Receivable, Modifications, Recorded Investment Total Accruing TDR Loans Accruing Troubled Debt Restructurings The amount of the outstanding recorded investment related to accruing financing receivables that have been modified by troubled debt restructurings. Unfunded commitments to consumer real estate and commercial loans classified as TDRs Loans and Leases Receivable, Impaired, Commitment to Lend Loans Removed from Troubled Debt Restructurings Status Loans Removed from Troubled Debt Restructurings Status Loans Removed from Troubled Debt Restructurings Status Unrecognized 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. Allowance for credit losses (Less than $0.1 million for commercial at December 31, 2015) 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. 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. Assumed remaining re-default rate used in determining impairment, high end of range (as a percent) 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. Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] TCF Financial Corporation Parent [Member] Preferred Stock Preferred Stock [Member] TCF Common Stock Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Treasury Stock and Other Treasury Stock [Member] Non-controlling Interests Noncontrolling Interest [Member] Statement Statement [Line Items] Increase (Decrease) in Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance (in shares) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income (loss), net of tax Net investment by (distribution to) non-controlling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Dividends on preferred stock Dividends, Preferred Stock, Cash Dividends on common stock Dividends, Common Stock, Cash 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 Stock compensation plans, net of tax Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Stock compensation plans, net of tax (in shares) Stock Issued During Period, Shares, 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 Balance (in shares) Statement of Financial Position [Abstract] 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 Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Statements of Financial Position Condensed Balance Sheet Statements, Captions [Line Items] Assets: Assets [Abstract] Cash and due from bank Cash and Cash Equivalents, at Carrying Value Investment in bank subsidiary Investment in Bank Subsidiaries Represents intercompany ownership interest in bank subsidiaries. Accounts receivable from bank subsidiary Due from Related Parties Other assets Other Assets Total assets Assets Liabilities and Equity: Liabilities and Equity [Abstract] Other liabilities Other Liabilities Total liabilities Liabilities Equity Stockholders' Equity Attributable to Parent Total liabilities and equity Liabilities and Equity Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Mortgage-backed securities: Other securities Other Debt Obligations [Member] 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 Gross gains recognized on sales of securities Available-for-sale Securities, Gross Realized Gains 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 available for sale Proceeds from Sale of Available-for-sale Securities Securities available for sale pledged as collateral Available-for-sale Securities Pledged as Collateral Impairment charges on available for sale securities 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] Gross Unrealized Gains Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Gross Unrealized Losses Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Fair Value Impairment charge on held to maturity securities Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Held-to-maturity Securities 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. Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Forward foreign exchange contracts Foreign Exchange Contract [Member] Interest rate contracts Interest Rate Contract [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] 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 Derivative Asset, 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 Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Public Float Entity Public Float 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. Earnings Per Share [Abstract] Computation of basic and diluted earnings per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets and Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Securities available for sale Available-for-sale Securities [Member] Other Contract 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 Other comprehensive income (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 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 Other comprehensive income (loss) Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 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 Assumptions Used in Calculations Defined Benefit Plan, Assumptions Used in Calculations [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Expected long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Final health care cost trend rate Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year Final health care cost trend rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Year that final health care trend rate is reached Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate 1% change in assumed health care cost trend rates Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] Effect on total service and interest cost components, increase Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components Effect on total service and interest cost components, decrease Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components Effect on postretirement benefits obligations, increase Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Effect on postretirement benefits obligations, decrease Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation Expected future benefit payments used to determine projected benefit obligations Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] 2017 Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 2018 Defined Benefit Plan, Expected Future Benefit Payments, Year Two 2019 Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2020 Defined Benefit Plan, Expected Future Benefit Payments, Year Four 2021 Defined Benefit Plan, Expected Future Benefit Payments, Year Five 2022-2026 Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Investments, All Other Investments [Abstract] Federal Home Loan Bank stock, at cost Federal Home Loan Bank Stock Federal Reserve Bank stock, at cost Federal Reserve Bank Stock Total investments Other Investments Impairment charges on investments Other than Temporary Impairment Losses, Investments Yield on investments, no stated maturity (as a percent) Other Investments Maturities with No Stated Maturity Yield Percentage Represents the yield on other investments which have no stated maturity. Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Fair Value, Measurements, Nonrecurring Interest rate swap Interest Rate Swap [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Net Investment Hedges Net Investment Hedging [Member] Basis of Presentation Valuation and Qualifying Accounts Disclosure [Line Items] Allowance for Loan and Lease Losses Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] 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.