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v3.21.1

Derivative Instruments and Hedging Activities (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) instrument | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |
Total return swap income | $ 2,844,000 | $ 1,984,000 |
Multifamily Housing Mortgage Revenue Bonds |  |  |
Derivative [Line Items] |  |  |
Bond subject to interest rate caps | 224,900,000 |  |
Total Return Swap, Callable |  |  |
Derivative [Line Items] |  |  |
Total return swap income | 2,800,000 |  |
Designated as Hedging Instrument | Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Aggregate carrying value of the interest rate swap contracts, liability | 0 |  | $ 2,400,000
Aggregate carrying value of the interest rate swap contracts, asset | 0 |  | 0
Not Designated as Hedging Instrument | Total Return Swap, Callable |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount | 224,900,000 |  |
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 |  |

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