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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, 2020
Mar. 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) 53,124 (254,135)
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 (8,094,371) 8,143,927
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, Purchases   6,050,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (4,472,667) (9,646,893)
Assets at Fair Value, ending balance 762,536,041 787,154,948
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 (1,332,480) (306,591)
Interest rate derivatives [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) 25,201 (306,591)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Derivative Asset (Liability), Settlements   (46,536)
Derivative Assets (Liabilities) at Fair Value, beginning balance 36,112 273,506
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 25,201 (306,591)
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) 16,726
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) 485,222
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   (2,767,166)
Assets at Fair Value, ending balance   46,406,868
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 36,555 18,792
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (2,138) (1,954)
Assets at Fair Value, ending balance 1,417,654 1,426,733
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] 35,142 35,730
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] (6,722,122) 7,639,913
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases [1]   6,050,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements [1] (4,470,529) (6,831,237)
Assets at Fair Value, ending balance [1] 761,082,275 $ 739,047,841
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.