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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance $ 928,701,121 $ 739,143,486 $ 816,370,069 $ 798,246,109
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) $ 1,285,386 $ 2,952,972 $ 4,057,755 $ 6,359,920
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income (Expense), Net Interest Income (Expense), Net Interest Income (Expense), Net Interest Income (Expense), Net
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income (Expense), Net Interest Income (Expense), Net Interest Income (Expense), Net Interest Income (Expense), Net
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 $ (48,024,749) $ (22,780,560) $ (39,087,606) $ (91,367,669)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 11,665,000 3,923,437 129,772,563 102,243,437
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (16,856,580) (14,341,223) (34,342,603) (105,723,152)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Other [1]       (860,533)
Assets at Fair Value, ending balance 876,770,178 708,898,112 876,770,178 708,898,112
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 (57,119) 2,836 (37,066) 147,585
Interest Rate Derivative Instruments [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Derivative Assets (Liabilities) at Fair Value, beginning balance 301,624 398,280 331,240 343,418
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense)   1,298,340 3,844,528  
Total gain (losses) included in earnings (interest income and interest expense) 1,215,389     4,497,078
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions   (1,313,061) (3,950,755)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements and redemptions (1,292,000)     (4,456,937)
Derivative Assets (Liabilities) at Fair Value, ending balance 225,013 383,559 225,013 383,559
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) (14,509) (88,722) 107,617
Bond Purchase Commitment [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance 138,100 8,953 98,929 964,404
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in other comprehensive (loss) income (250,548) (91,864) (211,377) (1,047,315)
Assets at Fair Value, ending balance (112,448) (82,911) (112,448) (82,911)
Taxable Mortgage Revenue Bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance 22,297,418 11,457,256 16,531,896 3,428,443
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) (6,050) (4,860) (18,149) (14,932)
Total gain (losses) included in other comprehensive (loss) income (1,676,780) (221,686) (2,213,376) (553,379)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 4,000,000 2,300,000 10,319,875 10,675,750
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (7,002,925) (2,676) (7,008,583) (7,848)
Assets at Fair Value, ending balance 17,611,663 13,528,034 17,611,663 13,528,034
Mortgage Revenue Bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Assets at Fair Value, beginning balance 905,963,979 [2] 727,278,997 [3] 799,408,004 [4] 793,509,844 [5]
Total gains (losses) (realized/unrealized) [Abstract]        
Total gain (losses) included in earnings (interest income and interest expense) 76,047 [2] 1,659,492 [3] 231,376 [4] 1,877,774 [5]
Total gain (losses) included in other comprehensive (loss) income (46,097,421) [2] (22,467,010) [3] (36,662,853) [4] (89,766,975) [5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and advances 7,665,000 [2] 1,623,437 [3] 119,452,688 [4] 91,567,687 [5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements and redemptions (8,561,655) [2] (13,025,486) [3] (23,383,265) [4] (101,258,367) [5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Other [1],[5]       (860,533)
Assets at Fair Value, ending balance 859,045,950 [2],[4] 695,069,430 [3] 859,045,950 [2],[4] 695,069,430 [3]
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 [2] $ 17,345 [3] $ 51,656 [4] $ 39,968 [5]
[1] The other line is related to a re-allocation of the loan loss allowance upon restructuring of the Live 929 Apartments MRBs and property loan.
[2] Mortgage revenue bonds includes both bonds held in trust as well as those held by the Partnership.
[3] Mortgage revenue bonds includes both bonds held in trust as well as those held by the Partnership.
[4] Mortgage revenue bonds includes both bonds held in trust as well as those held by the Partnership.
[5] Mortgage revenue bonds includes both bonds held in trust as well as those held by the Partnership.