Derivative Instruments and Hedging Activities (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) instrument	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Total return swap income	$ 1,984,000	$ 2,045,000
Multifamily Housing Mortgage Revenue Bonds
Derivative [Line Items]
Bond subject to interest rate caps	255,300,000
Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount	$ 175,000,000.0
Interest rate	2.30%
Aggregate carrying value of the interest rate swap contracts, asset	$ 0		$ 1,000,000.0
Aggregate carrying value of the interest rate swap contracts, liability	3,400,000		200,000
Not Designated as Hedging Instrument | Total Return Swap, Callable
Derivative [Line Items]
Derivative, notional amount	255,300,000
Derivative, fair value, net	$ 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