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Proportional Amortization Method, Applied, Amortization Expense Loans held for sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans Held For Sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans Held For Sale Net unrealized gain (loss) on securities available-for-sale OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number Paid-in Capital in excess of Par Additional Paid-in Capital [Member] Federal tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Weighted Average Interest Rate Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Rolling Year [Abstract] Collateral Type Real Property Collateral [Member] Real Property Collateral Tabular List, Table Tabular List [Table Text Block] Asset Allocation Parameters by Asset Class Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Strike price (in dollars per share) Strike Price Of Warrants Strike Price Of Warrants Contractual Maturity Federal Home Loan Bank, Advances, Floating Rate [Abstract] Accounting and Reporting Developments And Standards adopted in 2025 And Significant Standards Issued but Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Interest rate swaps and swaptions Interest rate swaps and swaptions Interest Rate Swaps and Swaptions [Member] Interest Rate Swaps and Swaptions [Member] Capital Securities Amount Outstanding Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount Issuance of FDIC Equity appreciation instrument Equity Instrument, FDIC Appreciation, Issued Equity Instrument, FDIC Appreciation, Issued 2032 Federal Home Loan Bank, Advance, Maturity, Year Seven Federal Home Loan Bank, Advance, Maturity, Year Seven Schedule of Carrying Amount and Estimated Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Vested (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Vested in Period, Weighted Average Exercise Price Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Vested in Period, Weighted Average Exercise Price Affordable housing tax credit write down Investment Program, Proportional Amortization Method, Elected, Impairment Loss Stand-by letters of credit Guarantor Obligations, Maximum Exposure, Undiscounted Debt Securities Other debt securities available-for-sale: Debt Securities [Member] Other comprehensive gain (loss), net of tax: Other Comprehensive Income (Loss), Tax [Abstract] Measurement Basis [Axis] Measurement Basis [Axis] 2026 Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year One Non-accrual loans with an allowance recorded: Financing Receivable,, With Related Allowance, Recorded Investment Financing Receivable,, With Related Allowance, Recorded Investment Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Cash dividends paid on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Defined Benefit Plan, Plan Assets, Category [Table] Defined Benefit Plan, Plan Assets, Category [Table] Net gain on loan sales Fair Value, Option, Changes in Fair Value, Gain (Loss) Shares issued for restricted stock, net of forfeitures (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Total recognized in other comprehensive income (loss) for the year (pre-tax) Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax Schedule of Cash and Cash Equivalents Schedule of Cash and Cash 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And Thereafter Finite-Lived Intangible Asset, Expected Amortization, Year Five And Thereafter Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Other Consumer Consumer Loan [Member] Net unrealized gain (loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Insider Trading Policies and Procedures [Line Items] New York State NEW YORK Schedule of Premises and Equipment and Estimated Useful Lives Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Financial Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Other Other Loans [Member] Other Loans Issuance and exercise of stock (in shares) Stock Issued During Period, Shares, New Issues LIABILITIES AND STOCKHOLDERS' EQUITY: Liabilities and Equity [Abstract] US State and Local State and Local Jurisdiction [Member] Cover [Abstract] Cover [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Portion at fair value measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Total Finite-Lived Intangible Assets, Net Total Debt Securities, Available-for-Sale, Unrealized Loss Position Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Borrowed Funds Borrowed Funds Debt, Long-Term and Short-Term, Combined Amount Core deposit and other intangibles Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Other servicing charges Other Servicing Charges Generated By Servicing Financial Assets, Amount The total amount of other servicing charges earned on loans serviced and subserviced for others during the period for which results of operations are presented. Retirement Benefits [Abstract] Series B Preferred Stock Series B Preferred Stock [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other Assets Other Assets [Member] Audit Information [Abstract] Audit Information [Abstract] Temporary Equity [Line Items] Temporary Equity [Line Items] Bargain purchase gain on Signature Transaction, as initially reported Bargain purchase gain Business Combination, Bargain Purchase, Gain Recognized, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Weighted-Average Term (in years) Financing Receivable, Modified, Weighted Average Term Increase from Modification Measurement Period Adjustments Prior Period Adjustment [Abstract] (Loss) income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Total capital, ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Revolving Loans Converted to Term Loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Flagstar Statutory Trust VI Flagstar Statutory Trust VI [Member] Flagstar Statutory Trust VI Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Schedule of Income Taxes Paid Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Net unrealized gain (loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Lease payments receivable Direct Financing Lease, Lease Receivable Total interest expense Interest expense - Borrowed funds Interest Expense, Operating Bifurcated Option Notes Unit Securities Bifurcated Option Notes Unit Securities [Member] Bifurcated option notes unit securities. Operating Leases: Operating Lease, Assets And Liabilities, Lessee [Abstract] Operating Lease, Assets And Liabilities, Lessee Texas TEXAS Document Fiscal Period Focus Document Fiscal Period Focus Compensation increase percentage Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Noncumulative convertible preferred stock (in shares) Temporary Equity, Shares Authorized Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Schedule of Differences between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding - Fair Value Option Fair Value Option, Disclosures [Table Text Block] Award Timing Method Award Timing Method [Text Block] Non-Accrual Loans Financing Receivable, Excluding Accrued Interest, Nonaccrual Net transaction costs Servicing Asset At Fair Value, Net Transaction Costs The total amount of net transaction costs earned on loans serviced and subserviced for others during the period for which results of operations are presented. Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Award Type [Axis] Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] 2028 Sales-Type and Direct Financing Leases, Payment to be Received, Year Three Parent company Parent Company [Member] Decrease in MSR fair value due to pay-offs, pay-downs, run-off, model changes and other Servicing Asset at Fair Value, Other Changes in Fair Value Retirement Plans And Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Fair Value of Assets Acquired and Liabilities Assumed Business Combination [Policy Text Block] Borrowed funds Interest Expense, Long-Term Debt Entity Address, City or Town Entity Address, City or Town Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Flagstar Statutory Trust VIII Flagstar Statutory Trust VIII [Member] Flagstar Statutory Trust VIII Officers And Directors Officers And Directors [Member] Officers And Directors Intangible Assets Intangible Assets Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Net increase (decrease) in short-term advances Proceeds from (Repayments of) Short-Term Debt Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Aggregate amount of time deposit accounts Time Deposits, at or Above FDIC Insurance Limit Allowance for Credit Losses on Loans and Leases and Unfunded Commitments Credit Loss, Financial Instrument [Policy Text Block] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Interest expense on short-term borrowings Interest Expense, Short-Term Borrowings Purchase Price consideration Business Combination, Consideration Transferred Entity Emerging Growth Company Entity Emerging Growth Company Total capital, ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual Total accumulated other comprehensive loss (pre-tax) Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Schedule of Unrealized Loss Positions on Investment Securities Held-to-Maturity Debt Securities, Held-to-Maturity [Table Text Block] Cash Collateral Pledged (Received) Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Outstanding, beginning balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Total loan commitments Unfunded Loan Commitment [Member] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year One Certificates of deposit Interest Expense, Time Deposits Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Total non-interest income Noninterest Income Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Net gain on loan sales and securitizations Gain (Loss) on Sales of Loans, Net Interest rate swaps Interest Rate Swaption [Member] Other assets Other Assets, Fair Value Disclosure NON-INTEREST EXPENSE: Noninterest Expense [Abstract] Cash and due from banks Cash and Due from Banks Affordable housing tax credits Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Loans held for investment Mortgage Loans Held for Investment [Member] Mortgage Loans Held for Investment Loans 90 days or greater past due and still accruing Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing Fair value of net identifiable assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Fair Value Of Net Assets And Liabilities, Net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Fair Value Of Net Assets And Liabilities, Net Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] FDIC Equity Appreciation Instrument Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Equity Appreciation Instrument Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Equity Appreciation Instrument Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Intangible Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Change in Projected Benefit Obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Weighted-Average Contractual Interest Rate Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification Number of Restricted Stock Awards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Securities and money market investments Interest and Dividend Income, Securities, Operating Income tax (benefit)/expense Income tax (benefit)/expense Income tax (benefit)/expense reported in net income Income Tax Expense (Benefit) Variable rate on spread Debt Instrument, Basis Spread on Variable Rate Non-accrual interest Deferred Tax Assets, Non-Accrual Interest Deferred Tax Assets, Non-Accrual Interest Certificates of deposit Interest-Bearing Domestic Deposit, Certificates of Deposits Other assets Other Assets Mutual Funds Fixed Income - Intermediate - Core Plus Defined Benefit Plan, Fixed Income, Intermediate Core Plus [Member] Defined Benefit Plan, Fixed Income, Intermediate Core Plus Balance at Beginning of Year Balance at End of Year Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value FHLB and FRB stock Federal Home Loan Bank And Federal Reserve Bank Stock, Fair Value Disclosure Federal Home Loan Bank And Federal Reserve Bank Stock, Fair Value Disclosure Document Information [Line Items] Document Information [Line Items] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Derivatives designated as hedging instruments: Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Premises and equipment Property, Plant and Equipment, Gross Fixed Rate Perpetual Noncumulative Convertible Series B Noncumulative Convertible Preferred Stock Series B [Member] Noncumulative Convertible Preferred Stock Series B Shares Outstanding Temporary Equity And Equity, Shares Outstanding [Abstract] Temporary Equity And Equity, Shares Outstanding Large-cap core Defined Benefit Plan, Equity, Large Cap Core [Member] Defined Benefit Plan, Equity, Large Cap Core Fair value Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Tier 1 Banking Regulation, Tier 1 Risk-Based Capital [Abstract] Cash flow hedge Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent US Federal Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] 2032 Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing In Rolling Year Seven Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing In Rolling Year Seven Tax exempt income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Non-vested balance (in shares) Non-vested balance at beginning of period (in shares) Non-vested balance at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Earlier of Contractual Maturity or Next Call Date Federal Home Loan Bank, Advances, Par Value, Earlier of Contractual Maturity or Next Call Date, Rolling Year [Abstract] FHLB lock out term Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate Unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Net cash (used in) provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Unvested, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares Purchase Price consideration Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Purchase Price Consideration Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Purchase Price Consideration Debt securities available-for-sale Fair Value Total debt securities available-for-sale Total debt securities available-for-sale Debt Securities, Available-for-Sale, Excluding Accrued Interest Weighted Average Interest Rate Federal Home Loan Bank, Advance, Maturity, Average Interest Rate [Abstract] Preferred stock (in usd per share) Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Estimated useful lives Property, Plant and Equipment, Useful Life Other assets Business Combination, Recognized Asset Acquired, Other Asset, Current Net interest income Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Total capital, amount Banking Regulation, Tier 1 Risk-Based Capital, Actual Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation expense Depreciation Transfer of loans from held for sale to held for investment Loan, Transfer from Held-for-Sale to Held-in-Portfolio PennFed Capital Trust III PennFed Capital Trust III [Member] PennFed Capital Trust III Fair value of assets acquired: Business Combination, Recognized Asset Acquired, Asset [Abstract] Interest income on lease financing Direct Financing Lease, Interest Income Equity Components [Axis] Equity Components [Axis] Originated year four Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Multi-family and commercial real estate Multi-Family And Commercial Real Estate [Member] Multi-Family And Commercial Real Estate Common Stock Defined Benefit Plan, Equity, Small Cap Value [Member] Defined Benefit Plan, Equity, Small Cap Value Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segment Number of Reportable Segments Deferred Tax Assets: Components of Deferred Tax Assets [Abstract] Non-taxable expense of bank-owned life insurance Effective Income Tax Rate Reconciliation, Non-Taxable Income And Expense Of Bank Owned Life Insurance Effective Income Tax Rate Reconciliation, Non-Taxable Income And Expense Of Bank Owned Life Insurance Commercial real estate Commercial Real Estate [Member] Lease financing Lease Financing Loans [Member] Lease Financing Loans Variable Interest Entities Variable Interest Entity Disclosure [Text Block] 2032 Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Seven Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Seven Entity Address, State or Province Entity Address, State or Province Common stock issued upon conversion (in shares) Temporary Equity, Shares, Common Stock Issuable Upon Conversion Temporary Equity, Shares, Common Stock Issuable Upon Conversion Thereafter Sales-Type and Direct Financing Leases, Payment to be Received, after Year Five Substandard Substandard [Member] Total interest income Interest and Dividend Income, Operating Special Mention Special Mention [Member] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Dividends paid on common stock Dividends, Common Stock 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Total collateral-dependent loans held for investment Financial Instruments, Owned, at Fair Value Loans and leases held for investment, net Loans Receivable, Fair Value Disclosure Mortgage servicing rights Mortgage servicing rights Mortgage Servicing Rights [Member] Derivative assets or liabilities which hedge the risk of overall changes in fair value of MSRs through the use of various derivatives including purchases of forward contracts on securities of Fannie Mae and Freddie Mac, the purchase/sale of U.S. Treasury futures contracts and the purchase/sale of euro dollar future contracts. These are accounted for as non-designated hedges. Individual: Individual [Axis] 401(k) plan contributions by employer Defined Contribution Plan, Cost Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Cash dividends paid on common stock Payments of Ordinary Dividends, Common Stock Change in loans held for sale, net Increase (Decrease) in Loan, Held-for-Sale Document Annual Report Document Annual Report Fair value adjustments: Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] Settlements Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 6.375% Fixed-to-Floating Rate Perpetual Noncumulative Series A Noncumulative Preferred Stock Series A [Member] Noncumulative Preferred Stock Series A Principal Forgiveness Principal Forgiveness [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Minimum for capital adequacy, amount Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Repayments of long-term debt issuances/advances Repayments of Long-Term Debt Deposits Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deposits Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deposits Entity Interactive Data Current Entity Interactive Data Current Related Allowance Financing Receivable, Related Allowance Financing Receivable, Related Allowance Year to date gross charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] 2026 Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Next 12 Rolling Months Mutual funds and common stock Mutual Fund [Member] Financing Receivable, Modified [Line Items] Financing Receivable, Modified [Line Items] Funded status (included in Other assets) Defined Benefit Plan, Funded (Unfunded) Status of Plan Revenue Recognition Revenue from Contract with Customer [Policy Text Block] INTEREST INCOME: Interest and Dividend Income, Operating [Abstract] Total non-interest expense Noninterest Expense Total securities Marketable Securities Convertible stock (in shares) Convertible Preferred Stock, Shares Issued upon Conversion Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Allowance for Credit Losses on Loans and Leases Allowance for Credit Losses [Text Block] Property, Plant and Equipment, Type Long-Lived Tangible Asset [Axis] Merger-related and restructuring expenses Noncash Merger Related Costs NON-INTEREST INCOME: Noninterest Income [Abstract] Combination - Interest Rate Reduction and Term/Payment Extension/Delay Combination - Interest Rate Reduction and Term/Payment Extension/Delay [Member] Combination - Interest Rate Reduction and Term/Payment Extension/Delay Amount Federal Home Loan Bank, Advances, Par Value, Earlier of Contractual Maturity or Next Put or Convert Date, Rolling Year [Abstract] Total liabilities assumed Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liabilities Flagstar Statutory Trust II Flagstar Statutory Trust II [Member] Flagstar Statutory Trust II Liquidation preference per share (in usd per share) Temporary Equity, Liquidation Preference Per Share Series D Preferred Stock Series D Preferred Stock [Member] 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Software expense Software Expense Software Expense Entity Central Index Key Entity Central Index Key Warrant or right, coupon rate Warrant Or Right, Coupon Rate Warrant Or Right, Coupon Rate PEO Name PEO Name Total derivative (loss) gain Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Loans Held for Investment Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Defined Benefit Plan [Table] Defined Benefit Plan [Table] Minimum for capital adequacy, amount Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Total FHLB advances Federal Home Loan Bank, Advances, Par Value Non-interest-bearing accounts Non-interest-bearing accounts Noninterest-Bearing Deposit Liabilities Flagstar Statutory Trust VII Flagstar Statutory Trust VII [Member] Flagstar Statutory Trust VII Mortgage-backed securities forwards Mortgage-backed securities forwards Mortgage-Backed Securities, Other [Member] New York Community Capital Trust XI New York Community Capital Trust XI [Member] New York Community Capital Trust XI Offering price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Preferred stock - Series B Beginning balance Ending balance Temporary Equity, Carrying Amount, Attributable to Parent Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Minimum for capital adequacy, ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Class of Stock [Domain] Class of Stock [Domain] Annuity payments Defined Benefit Plan, Benefit Obligation, Benefits Paid Statutory federal income tax at 21% Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Common/Collective Trust-Equity Large cap value Defined Benefit Plan, Collective Trust Equity Securities, Large Cap Value [Member] Defined Benefit Plan, Collective Trust Equity Securities, Large Cap Value Cumulative Amount of Fair Value Hedging Adjustments Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Acquisition accounting and fair value adjustments on debt Deferred Tax Liabilities, Acquisition Accounting And Fair Value Adjustments On Debt Deferred Tax Liabilities, Acquisition Accounting And Fair Value Adjustments On Debt 2027 Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Two Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] U.S. Large-Cap Defined Benefit Plan, Equity Securities, US, Large Cap [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Loans Held-for-Sale Financing Receivable, Held-for-Sale [Policy Text Block] Accumulated Other Comprehensive Loss, Net of Tax Total AOCI Attributable to Parent [Member] Mid-cap core Defined Benefit Plan, Equity, Mid Cap Core [Member] Defined Benefit Plan, Equity, Mid Cap Core Investments [Domain] Investments [Domain] 2028 Federal Home Loan Bank, Advance, Maturity, Year Three Revolving Loans Converted to Term Loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Shares issued for restricted stock awards Stock Issued Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Derivative 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