Derivative Instruments and Hedging Activities (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) instrument	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) instrument	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Total return swap income	$ 2,283,000	$ 2,633,000	$ 4,827,000	$ 5,477,000
Multifamily Housing Mortgage Revenue Bonds
Derivative [Line Items]
Bond subject to interest rate caps	224,000,000		224,000,000
Total Return Swap, Callable
Derivative [Line Items]
Total return swap income	2,300,000	$ 2,700,000	4,800,000	$ 5,500,000
Not Designated as Hedging Instrument | Total Return Swap, Callable
Derivative [Line Items]
Derivative, notional amount	224,000,000		224,000,000
Derivative, fair value, net	$ 0		$ 0		$ 0
Not Designated as Hedging Instrument | Total Return Swap, Callable | Multifamily Housing Mortgage Revenue Bonds
Derivative [Line Items]
Number of derivative instruments | instrument	4		4