Total unpaid principal balance Total Loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process Four years Debt Instrument, Redemption, Period Four [Member] Year two Due Year Two [Member] Due year two [Member] Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Due after five years through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Weighted-Average Yield Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Weighted-Average Yield Additional Paid-in Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Receive fixed callable Interest Rate Swap, Receive Fixed Callable [Member] Interest Rate Swap, Receive Fixed Callable [Member] Schedule of Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Maximum principal amount Guarantor Obligations, Maximum Exposure, Undiscounted Available-for-sale securities Total AFS Investment Securities Debt Securities [Member] Provision (Benefit) Other Comprehensive Income (Loss), Tax [Abstract] Net change in fair value of hedged items, financial derivatives, loans held sale, and trading securities Net Change In Fair Value, Trading Securities, Hedged Assets, Financial Derivatives And Loans Held For Sale Net Change In Fair Value, Trading Securities, Hedged Assets, Financial Derivatives And Loans Held For Sale Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Held-to-Maturity Securities Debt Securities, Held-to-Maturity, Maturity [Abstract] Recovery Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Total Financing Receivable, before Allowance for Credit Loss [Abstract] Due after one year through five years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Adjustment to Compensation, Amount Adjustment to Compensation Amount Other assets Increase (Decrease) in Other Operating Assets Principles of Consolidation Consolidation, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Notional amount Notional Amount Derivative Asset, Notional Amount Employee Stock Option Share-Based Payment Arrangement, Option [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Cash dividends, common stock Dividends, Common Stock, Cash Total Equity Beginning Balance Ending Balance Equity, Attributable to Parent Due after five years through ten years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] After Tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Financial Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Issuance of Class C Common Stock (in shares) Stock Issued During Period, Shares, New Issues Liabilities and Equity: Liabilities and Equity [Abstract] Medium-term notes Medium-Term Note [Member] Cover page. 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] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 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 [Line Items] Debt Instrument [Line Items] HedgedItemsinFairValueHedgingRelationship [Table] HedgedItemsinFairValueHedgingRelationship [Table] Hedged Items in Fair Value Hedging Relationship [Table] Maximum amount of discount notes outstanding at any month end Short-Term Debt, Maximum Month-end Outstanding Amount Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other Assets Other Assets [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Other liabilities Accounts Payable and Other Accrued Liabilities Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Net unrealized losses 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] Due within one year: Short-Term Debt [Abstract] Total interest expense Total Interest Expense Interest expense Interest Expense, Operating Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Average Outstanding, Amount Short-Term Debt, Average Outstanding Amount Schedule of Hedged Items in Fair Value Hedging Relationships Hedged Items In Fair Value Hedging Relationships [Table Text Block] Hedged Items in Fair Value Hedging Relationships [Table Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Nonaccrual Loans Financing Receivable, Excluding Accrued Interest, Nonaccrual Debt securities of consolidated trusts held by third parties Variable Interest Entity, Consolidated, Fair Value Disclosure, Liabilities Variable Interest Entity, Consolidated, Fair Value Disclosure, Liabilities Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Award Type Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Trading Symbol Trading Symbol Entity Address, City or Town Entity Address, City or Town Due within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Weighted-Average Yield Available-for-sale Securities, Debt Maturities, Next Twelve Months, Weighted-Average Yield Class of Financing Receivable, Type [Axis] Class of Financing Receivable [Axis] Due within one year Due Within One Year [Member] Due Within One Year Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Three years 2029 Long-Term Debt, Maturity, Year Three Cash collateral Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset 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] Year four Due Year Four [Member] Due year four [Member] Non-interest income Noninterest Income Class C non-voting common stock Common Class C [Member] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Schedule of Farmer Mac Investment Securities Marketable Securities [Table Text Block] Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Other Assets Other Assets, Fair Value Disclosure Operating expenses: Noninterest Expense [Abstract] Class of Financing Receivable, Type [Domain] Class of Financing Receivable [Domain] 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] Guarantee and commitment obligation Guarantor Obligations, Current Carrying Value Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Due after one year through five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Medium-term notes due in: Maturities of Long-Term Debt [Abstract] Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Investment securities and cash equivalents Interest Income Investments and Cash Equivalents Interest and Dividend Income, Securities, Operating Income tax expense Income Tax Expense (Benefit) Class B voting common stock Common Class B [Member] Beginning Balance Ending Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as hedge Designated as Hedging Instrument [Member] Unsecuritized Unsecuritized [Member] Unsecuritized, no in a trust[Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Due within one year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Held-to-maturity, at amortized cost Amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Debt Securities, Held-to-Maturity, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Schedule of Guarantor Obligations [Table] Guarantor Obligation [Table] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Thereafter Due After Year Four [Member] Due After Year Four 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] Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Other income Noninterest Income, Other Operating Income Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] HedgedItemsinFairValueHedgingRelationship [Line Items] HedgedItemsinFairValueHedgingRelationship [Line Items] [Line Items] for HedgedItemsinFairValueHedgingRelationship [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Maturities of notes Debt Instrument, Term Available-for-sale, at fair value (amortized cost of $14,269,843 and $13,813,551, respectively) AFS investment securities Total fair value Debt Securities, Available-for-Sale, Excluding Accrued Interest Proceeds from sale of real estate owned Proceeds from Sale of Other Real Estate Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share 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 Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Three years Debt Instrument, Redemption, Period Three [Member] Gross Amount Recognized Derivative Liability, Subject to Master Netting Arrangement, before Offset Gains/(losses) on financial derivatives Gain (Loss) on Derivative Instruments [Member] Equity Components [Axis] Equity Components [Axis] Total Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Auction-rate certificates backed by Government guaranteed student loans Auction Rate Securities [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Dividends paid on common and preferred stock Payments of Ordinary Dividends Commercial Real Estate Commercial Real Estate [Member] Entity Address, State or Province Entity Address, State or Province Substandard Substandard [Member] Total interest income Interest income Interest and Dividend Income, Operating Special mention Special Mention [Member] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Loans Loans Receivable, Fair Value Disclosure Premium/discount amortization recognized on hedged items Premium (Discount), Recognized on Hedged Instrument Premium (Discount), Recognized on Hedged Instrument Individual: Individual [Axis] Guarantee and commitment fees receivable Increase (Decrease) in Other Receivables Entities [Table] Entities [Table] Max Exposure to Loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Broadband Infrastructure Rural Infrastructure, Broadband Infrastructure Segment [Member] Rural Infrastructure, Broadband Infrastructure Segment Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Interest income: Interest and Dividend Income, Operating [Abstract] Funding Treasury, Funding Segment [Member] Treasury, Funding Segment Weighted- Average Yield Held-To-Maturity Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] Held-to-Maturity Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] Non-interest income/(expense): Noninterest Income [Abstract] Thereafter Debt Instrument, Redemption, After Period Five [Member] Period after five representing period after fifth most current period of debt redemption features under terms of the debt agreement. 5.700% Non-Cumulative Preferred Stock, Series D Series D Series D Preferred Stock [Member] Guarantee and commitment fees Investment Banking, Advisory, Brokerage, And Underwriting Fees And Commissions, Adjusted Investment Banking, Advisory, Brokerage, And Underwriting Fees And Commissions, Adjusted Entity Central Index Key Entity Central Index Key PEO Name PEO Name 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] Weighted-Average Yield Available-for-sale Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] Available-for-sale Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] Schedule of Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged assets Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Total due after one year Long-Term Debt, Excluding Current Maturities Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Due after one year: Long-Term Debt, Current and Noncurrent [Abstract] Interest settlements reclassified from AOCI into net income on derivatives Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 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 Entity Address, Address Line Two Entity Address, Address Line Two Accumulated Other Comprehensive Loss Accumulated Other comprehensive (loss)/ income: AOCI Attributable to Parent [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] FINANCIAL DERIVATIVES Derivative Instruments and Hedging Activities Disclosure [Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Total Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Schedule of Long-Term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Compensation and employee benefits Labor and Related Expense SARs and restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Document Quarterly Report Document Quarterly Report Investments Treasury, Investments Segment [Member] Treasury, Investments Segment Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Schedule of Fair Value Inputs, Assets and Liabilities, Quantitative Information Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag Interest-Only Farmer Mac Guaranteed Securities US Government-sponsored Enterprises Debt Securities [Member] Other income Other Income [Member] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Total Total Amounts of Line Items Presented in the Consolidated Statement of Income Total Amounts of Line Items Presented in the Consolidated Statement of Income Due within one year Held-To-Maturity Securities, Debt Maturities, Next Twelve Months, Weighted-Average Yield Held-To-Maturity Securities, Debt Maturities, Next Twelve Months, Weighted-Average Yield (Provision for)/release of losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal), Adjusted Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal), Adjusted Total Investment Securities Investments Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Allowance for Losses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Allowance for Credit Loss Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Allowance for Credit Loss Loans: Financing Receivable, after Allowance for Credit Loss [Abstract] Prepaid expenses and other assets Prepaid Expense and Other Assets Non-PEO NEO Non-PEO NEO [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Offsetting Assets Offsetting Assets [Table Text Block] All Award Types Award Type [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Other Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Medium term notes called during the period Medium Term Notes Called During the Period Medium Term Notes Called During the Period Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total provision for allowance for losses Provision for Loan, Lease, And Other Losses, Noncash Provision for Loan, Lease, And Other Losses, Noncash Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Estimated Fair Value Estimate of Fair Value Measurement [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Financial instruments pledged Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Accumulated other comprehensive (loss)/income, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax 2027 Long-Term Debt, Maturity, Year One Financial Instruments [Domain] Financial Instruments [Domain] Due after ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Five years Long-Term Debt, Maturity, Year Five Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Schedule of Long-Term Standby Purchase Commitments Schedule of Long-Term Standby Purchase Commitments [Table Text Block] Schedule of Long-Term Standby Purchase Commitments Expense recognized on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Proceeds from repayment of loans purchased as held for investment Proceeds from Principal Repayment, Loan and Lease, Held-for-Investment Minimum Minimum [Member] Net interest income after provision for losses Interest Income (Expense), after Provision for Loan Loss Payments to redeem notes payable Repayments of Notes Payable Net amount Derivative Liability, Including Not Subject To Master Netting Arrangement, After Offset And Deduction, Net Amount Derivative Liability, Including Not Subject To Master Netting Arrangement, After Offset And Deduction, Net Amount Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Capital required for capital adequacy Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum NOTES PAYABLE Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net income, diluted EPS Net Income (Loss) Available to Common Stockholders, Diluted Collateral [Domain] Collateral Held [Domain] GUARANTEES AND COMMITMENTS Commitments and Contingencies Disclosure [Text Block] Due after five years through ten years Held-To-Maturity Securities, Debt Maturities, After Five Through Ten Years, Weighted Average Yield Held-To-Maturity Securities, Debt Maturities, After Five Through Ten Years, Weighted Average Yield Weighted-average shares, diluted EPS (in shares) Weighted Average Number of Shares Outstanding, Diluted Outstanding, Weighted - average rate Short-term debt, weighted average rate Short-Term Debt, Weighted Average Interest Rate, at Point in Time Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] 2029 Long-Term Debt With Interest Rate Reset, Maturity, Year Three Long-Term Debt With Interest Rate Reset, Maturity, Year Three Cleared Swaps Cleared Swaps [Member] Cleared Swaps Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Purchases of tax credits Payments to Acquire Tax Credits Payments to Acquire Tax Credits Weighted- Average Remaining Term (in years) Derivative, Average Remaining Maturity Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report Other stock-based award activity APIC, Share-Based Payment Arrangement, Other, Increase for Cost Recognition Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Notes Payable Current portion of medium-term notes Long-Term Debt [Member] Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date INCOME TAXES Income Tax Disclosure [Text Block] Class A voting common stock Common Class A [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Net amount Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Stock Appreciation Rights and Restricted Stock Stock Appreciation Rights and Restricted Stock [Member] Stock Appreciation Rights and Restricted Stock Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Unrealized loss position for less than 12 months Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Charge-offs Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff Range [Axis] Statistical Measurement [Axis] Share repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Charge-offs Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Tax payments related to share-based awards Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net income attributable to common stockholders Net income attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Entity Information [Line Items] Entity Information [Line Items] Other comprehensive (loss)/income net of tax Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net effective spread Net Effective Spread Net Effective Spread Power & Utilities Rural Infrastructure, Power & Utilities Segment [Member] Rural Infrastructure, Power & Utilities Segment Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Operating expenses Noninterest Expense, Excluding Loan, Lease and Other Losses, Adjusted Noninterest Expense, Excluding Loan, Lease and Other Losses, Adjusted Renewable energy investment tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Amount Off-balance sheet assets under management Off Balance Sheet Program Assets Off Balance Sheet Program Assets Level 1 Fair Value, Inputs, Level 1 [Member] Beginning balance ( in shares) Ending balance (in shares) Shares, Outstanding Regulatory fees Regulatory Fees Regulatory Fees Guarantee and commitment obligation Guarantee obligations issued after January 1, 2003 [Member] Guarantee obligations issued after January 1, 2003 [Member] Operating expenses Noninterest Expense, Excluding Loan, Lease and Other Losses Noninterest Expense, Excluding Loan, Lease and Other Losses Accrued interest payable Increase (Decrease) in Accrued Liabilities Diluted earnings per common share (in dollars per share) Diluted EPS (in dollars per share) Earnings Per Share, Diluted In Consolidated Trusts In Consolidated Trusts [Member] In Consolidated Trusts [Member] Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Loans modified Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Cash dividends, preferred stock Dividends, Preferred Stock, Cash Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted-Average Yield Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted-Average Yield Consolidation Items [Domain] Consolidation Items [Domain] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Purchases of loans held for investment Payment for Acquisition, Loan, Held-for-Investment Unconsolidated VIE Variable Interest Entity, Not Primary Beneficiary [Member] Repurchase of Class C Common Stock Repurchase of Class C Common Stock Stock Repurchased and Retired During Period, Value Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Total Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date Loans held for investment, at amortized cost Total Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Gains/(losses) on financial derivatives Gains (losses) on financial derivatives Gain (Loss) on Derivative Instruments, Net, Pretax Schedule of Unrealized Losses on Available-for-Sale Investment Securities Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Other liabilities Increase (Decrease) in Other Operating Liabilities Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Allowance for losses Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Weighted- Average Receive Rate Derivative, Average Variable Interest Rate Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Income tax expense Income Tax Expense (Benefit), Adjusted Income Tax Expense (Benefit), Adjusted Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Collateral [Axis] Collateral Held [Axis] Year Three Financing Receivable, Originated Two Years before Latest Fiscal Year [Abstract] Financing Receivable, Originated Two Years before Latest Fiscal Year Consolidated Entities [Domain] Consolidated Entities [Domain] Due within one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Loans held for investment, at amortized cost Loans [Member] Net Amount Presented in the Consolidated Balance Sheet Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Total on- and off-balance sheet segment assets at principal balance On And Off Balance Sheet Program Assets, At Principal Balance On And Off Balance Sheet Program Assets, At Principal Balance Transaction [Domain] Transaction [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Unrealized Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Current Fiscal Year End Date Current Fiscal Year End Date Unrealized Loss 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Corporate AgFinance Agricultural Finance - Corporate AgFinance loans Agriculture Finance, Corporate AgFinance Segment [Member] Agriculture Finance, Corporate AgFinance Segment Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Allowance for losses Allowance for Losses Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Due within one year Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Long-Term Standby Purchase Commitments Long-Term Standby Purchase Commitments [Member] Long-Term Standby Purchase Commitments [Member] Interest Income Loans Loans and Finance Receivables [Member] Net income attributable to common stockholders (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Basic and Diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Net Amount Presented in the Consolidated Balance Sheet Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Less reclassification adjustments, provision (benefit) Reclassification from AOCI, Current Period, Tax Less reclassification adjustments, before tax Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Liabilities: Offsetting Derivative Liabilities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Consolidated Entities [Axis] Consolidated Entities [Axis] Year Four Financing Receivable, Originated Three Years before Latest Fiscal Year [Abstract] Financing Receivable, Originated Three Years before Latest Fiscal Year Segment core earnings Segment Core Earnings Segment core earnings - net income (loss) available to common shareholders, basic, adjusted for reconciling items related to segment reporting 2027 Long-Term Debt With Interest Rate Reset, Maturity, Year One Long-Term Debt With Interest Rate Reset, Maturity, Year One Weighted-average yield Available-for-sale Securities, Debt Maturities, Weighted-Average Yield Available-for-sale Securities, Debt Maturities, Weighted-Average Yield Pay fixed non-callable Interest Rate Swap, Pay Fixed Non-Callable [Member] Interest Rate Swap, Pay Fixed Non-Callable [Member] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Capital Banking Regulation, Total Capital, Actual Income tax benefit/(expense) related to other comprehensive (loss)/income Other comprehensive income/(loss), provision (benefit) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Loans acquired through non-cash transactions Noncash Or Part Noncash Acquisition, Loans Acquired Noncash Or Part Noncash Acquisition, Loans Acquired Schedule of Fair Value Measurements Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Netting adjustments Gross Amounts offset in the Consolidated Balance Sheet Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Uncleared Swaps Uncleared Swaps [Member] Uncleared Swaps Insider Trading Arrangements [Line Items] Total Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Year one Due Year One [Member] Due Year One Current Financial Asset, Not Past Due [Member] Allowance for losses Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Total Liabilities Liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Loans modified, percent of loan portfolio Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 4.875% Non-Cumulative Preferred Stock, Series G Series G Series G Preferred Stock [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Due after ten years Held-To-Maturity Securities, Debt Maturities, After Ten Years, Weighted-Average Yield Held-To-Maturity Securities, Debt Maturities, After Ten Years, Weighted-Average Yield Proceeds from repayment of available-for-sale investment securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Netting Adjustments Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Issuance of Class C Common Stock Stock Issued During Period, Value, New Issues Five years Debt Instrument, Redemption, Period Five [Member] Uncleared derivatives Uncleared Derivatives [Member] Uncleared Derivatives ABS Asset-Backed Securities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Total Total Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]