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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 ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance $ 818,340,970 $ 782,862,049
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) 2,143,901 (364,187)
Total gain (losses) Included in earnings (impairment of securities and provision for credit loss) (7,318,590)  
Total gain (losses) Included in earnings (gain on sale of securities) 1,416,023  
Total gain (losses) included in other comprehensive (loss) income 33,285,329 40,330,635
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 9,513,450 19,279,527
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sale of securities (43,349,357)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (17,335,422) (23,767,054)
Assets at Fair Value, ending balance 796,696,304 818,340,970
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets or liabilities held (7,201,691) (499,835)
Interest Rate Derivative Financial Instruments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Derivative Assets (Liabilities) at Fair Value, beginning balance 10,911 626,633
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) 2,026,070 (499,835)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   29,527
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Derivative Asset (Liability), Settlements (1,715,478) (145,414)
Derivative Assets (Liabilities) at Fair Value, beginning balance 321,503 10,911
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets or liabilities held 116,899 (499,835)
Bond Purchase Commitment [Member]    
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in other comprehensive (loss) income 431,879  
Assets at Fair Value, ending balance 431,879  
Public housing capital fund trusts [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance 43,349,357 48,672,086
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) (7,219) (6,708)
Total gain (losses) Included in earnings (gain on sale of securities) 1,416,023  
Total gain (losses) included in other comprehensive (loss) income (1,408,804) 984,021
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sale of securities (43,349,357)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (6,300,042)
Assets at Fair Value, ending balance   43,349,357
Taxable Mortgage Revenue Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance 1,383,237 1,409,895
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in other comprehensive (loss) income 136,046 26,428
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (8,846) (53,086)
Assets at Fair Value, ending balance 1,510,437 1,383,237
Mortgage Revenue Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance [1] 773,597,465 732,153,435
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) [1] 125,050 142,356
Total gain (losses) Included in earnings (impairment of securities and provision for credit loss) [1] (7,318,590)  
Total gain (losses) included in other comprehensive (loss) income [1] 34,126,208 39,320,186
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases [1] 9,513,450 19,250,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements [1] (15,611,098) (17,268,512)
Assets at Fair Value, ending balance [1] 794,432,485 $ 773,597,465
Total amount of gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to assets or liabilities held [1] $ (7,318,590)  
[1] Mortgage revenue bonds include both bonds held in trust as well as those held by the Partnership.