v3.26.1
Fair Value of Financial Instruments - Summary of Activity Related to Level 3 Assets and Liabilities (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance $ 1,054,390,610 $ 1,053,154,881
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) (43,645) $ 18,747
Total gain (losses) Included in earnings (provision for credit losses) $ 2,086,858  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income (Expense), Operating Interest Income (Expense), Operating
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax
Total gain (losses) included in other comprehensive (loss) income $ (8,394,974) $ (5,635,059)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 8,451,324 21,501,043
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (4,698,575) (12,059,484)
Principal redeemed via deed in lieu of foreclosure (117,006,934)  
Allowance for credit loss written off upon deed in lieu of foreclosure 6,620,142  
Assets at Fair Value, ending balance 941,404,806 1,056,980,128
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets or liabilities held 2,097,978 16,967
Mortgage Revenue Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance 1,007,904,386 1,026,483,796
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) (37,258) 22,059
Total gain (losses) Included in earnings (provision for credit losses) 2,009,653  
Total gain (losses) included in other comprehensive (loss) income (8,068,601) (6,121,797)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 151,324 14,101,043
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (4,474,915) (11,921,137)
Principal redeemed via deed in lieu of foreclosure (114,221,934)  
Allowance for credit loss written off upon deed in lieu of foreclosure 6,430,247  
Assets at Fair Value, ending balance 889,692,902 1,022,563,964
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets or liabilities held 2,020,773 16,967
Bond Purchase Commitment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance 3,323,510  
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in other comprehensive (loss) income (368,337)  
Assets at Fair Value, ending balance 2,955,173  
Taxable Mortgage Revenue Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance 43,162,714 26,671,085
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) (6,387) (3,312)
Total gain (losses) Included in earnings (provision for credit losses) 77,205  
Total gain (losses) included in other comprehensive (loss) income 41,964 486,738
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 8,300,000 7,400,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (223,660) (138,347)
Principal redeemed via deed in lieu of foreclosure (2,785,000)  
Allowance for credit loss written off upon deed in lieu of foreclosure 189,895  
Assets at Fair Value, ending balance 48,756,731 $ 34,416,164
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets or liabilities held $ 77,205