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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance $ 1,041,038,995 $ 1,018,024,584 $ 1,053,154,881 $ 952,333,636
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) $ (1,820) $ 1,157,988 (256,892) 1,276,619
Total gain (losses) Included in earnings (provision for credit losses)     $ (8,707,000) 169,308
Total gain (losses) Included in earnings(gain on sale of mortgag revenue bond)       $ 1,012,581
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 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 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 $ 18,081,653 $ 17,577,958 $ 11,638,887 $ (5,190,307)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 20,769,795 40,512,542 65,782,602 151,262,402
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       (8,221,234)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (30,756,695) (24,523,416) (72,480,550) (39,893,349)
Assets at Fair Value, ending balance 1,049,131,928 1,052,749,656 1,049,131,928 1,052,749,656
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets or liabilities held 11,060 17,344 (8,758,164) 220,887
Derivative Instruments [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Derivative Assets (Liabilities) at Fair Value, beginning balance   0   265
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense)   0   (265)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements and redemptions   0   0
Derivative Assets (Liabilities) at Fair Value, ending balance   0   0
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets or liabilities held   0   (265)
Bond Purchase Commitment [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance 1,833,078 46,238   197,788
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in other comprehensive (loss) income 743,003 (46,238) 2,576,081 (197,788)
Assets at Fair Value, ending balance 2,576,081 0 2,576,081 0
Taxable Mortgage Revenue Bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance 34,742,457 15,926,321 26,671,085 21,460,288
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) (7,566) (3,073) (12,616) (12,017)
Total gain (losses) Included in earnings (provision for credit losses)     (267,100)  
Total gain (losses) included in other comprehensive (loss) income 617,896 938,468 1,118,187 842,634
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 6,023,250 4,000,000 14,223,250 10,077,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (218,500) (1,003,200) (575,269) (12,509,389)
Assets at Fair Value, ending balance 41,157,537 19,858,516 41,157,537 19,858,516
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets or liabilities held     (267,100)  
Mortgage Revenue Bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance 1,004,463,460 1,002,052,025 1,026,483,796 930,675,295
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) 5,746 1,161,061 (244,276) 1,288,901
Total gain (losses) Included in earnings (provision for credit losses)     (8,439,900) 169,308
Total gain (losses) Included in earnings(gain on sale of mortgag revenue bond)       1,012,581
Total gain (losses) included in other comprehensive (loss) income 16,720,754 16,685,728 7,944,619 (5,835,153)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 14,746,545 36,512,542 51,559,352 141,185,402
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       (8,221,234)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (30,538,195) (23,520,216) (71,905,281) (27,383,960)
Assets at Fair Value, ending balance 1,005,398,310 1,032,891,140 1,005,398,310 1,032,891,140
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets or liabilities held $ 11,060 $ 17,344 $ (8,491,064) $ 221,152