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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
Mar. 31, 2021
Mar. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance $ 796,696,304 $ 818,340,970
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) 1,840,698 53,124
Total gain (losses) Included in earnings (impairment of securities and provision for credit loss)   (1,357,681)
Total gain (losses) Included in earnings (gain on sale of securities)   1,416,023
Total gain (losses) included in other comprehensive (loss) income (16,419,767) (8,094,371)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2,071,500  
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 (10,581,550) (4,472,667)
Assets at Fair Value, ending balance 773,607,185 762,536,041
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 7,451 (1,332,480)
Interest Rate Derivative Financial Instruments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Derivative Assets (Liabilities) at Fair Value, beginning balance 321,503 10,911
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) 1,806,167 25,201
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Derivative Asset (Liability), Settlements (1,800,294)  
Derivative Assets (Liabilities) at Fair Value, beginning balance 327,376 36,112
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 7,451 25,201
Bond Purchase Commitment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance 431,879  
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in other comprehensive (loss) income (120,970)  
Assets at Fair Value, ending balance 310,909  
Public housing capital fund trusts [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance   43,349,357
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense)   (7,219)
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)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sale of securities   (43,349,357)
Taxable Mortgage Revenue Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance 1,510,437 1,383,237
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in other comprehensive (loss) income (64,112) 36,555
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (2,337) (2,138)
Assets at Fair Value, ending balance 1,443,988 1,417,654
Mortgage Revenue Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Assets at Fair Value, beginning balance [1] 794,432,485 773,597,465
Total gains (losses) (realized/unrealized) [Abstract]    
Total gain (losses) included in earnings (interest income and interest expense) [1] 34,531 35,142
Total gain (losses) Included in earnings (impairment of securities and provision for credit loss) [1]   (1,357,681)
Total gain (losses) included in other comprehensive (loss) income [1] (16,234,685) (6,722,122)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases [1] 2,071,500  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements [1] (8,778,919) (4,470,529)
Assets at Fair Value, ending balance [1] $ 771,524,912 761,082,275
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]   $ (1,357,681)
[1] Mortgage revenue bonds includes both bonds held in trust as well as those held by the Partnership.