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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 |  |

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