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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance $ 1,018,024,584 $ 928,701,121 $ 952,333,636 $ 816,370,069
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) $ 1,157,988 $ 1,285,386 1,276,619 $ 4,057,755
Total gain (losses) Included in earnings (impairment of securities and provision for credit loss)     169,308  
Total gain (losses) Included in earnings (gain on sale of securities)     $ 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, Net Derivative Asset (Liability), 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 $ 17,577,958 $ (48,024,749) $ (5,190,307) $ (39,087,606)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 40,512,542 11,665,000 151,262,402 129,772,563
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 (24,523,416) (16,856,580) (39,893,349) (34,342,603)
Assets at Fair Value, ending balance 1,052,749,656 876,770,178 1,052,749,656 876,770,178
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 17,344 (57,119) 220,887 (37,066)
Interest Rate Derivative Instruments [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Derivative Assets (Liabilities) at Fair Value, beginning balance   301,624 265 331,240
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense)   1,215,389 (265) 3,844,528
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements and redemptions   (1,292,000)   (3,950,755)
Derivative Assets (Liabilities) at Fair Value, ending balance 0 225,013 0 225,013
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   (74,463) (265) (88,722)
Bond Purchase Commitment [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance 46,238 138,100 197,788 98,929
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in other comprehensive (loss) income (46,238) (250,548) (197,788) (211,377)
Assets at Fair Value, ending balance 0 (112,448) 0 (112,448)
Taxable Mortgage Revenue Bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance 15,926,321 22,297,418 21,460,288 16,531,896
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) (3,073) (6,050) (12,017) (18,149)
Total gain (losses) included in other comprehensive (loss) income 938,468 (1,676,780) 842,634 (2,213,376)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 4,000,000 4,000,000 10,077,000 10,319,875
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (1,003,200) (7,002,925) (12,509,389) (7,008,583)
Assets at Fair Value, ending balance 19,858,516 17,611,663 19,858,516 17,611,663
Mortgage Revenue Bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance [1] 1,002,052,025 905,963,979 930,675,295 799,408,004
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) [1] 1,161,061 76,047 1,288,901 231,376
Total gain (losses) Included in earnings (impairment of securities and provision for credit loss) [1]     169,308  
Total gain (losses) Included in earnings (gain on sale of securities) [1]     1,012,581  
Total gain (losses) included in other comprehensive (loss) income [1] 16,685,728 (46,097,421) (5,835,153) (36,662,853)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances [1] 36,512,542 7,665,000 141,185,402 119,452,688
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales [1]     (8,221,234)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions [1] (23,520,216) (8,561,655) (27,383,960) (23,383,265)
Assets at Fair Value, ending balance [1] 1,032,891,140 859,045,950 1,032,891,140 859,045,950
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 [1] $ 17,344 $ 17,344 $ 221,152 $ 51,656
[1] Mortgage revenue bonds includes both bonds held in trust as well as those held by the Partnership.