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v3.20.2

Derivative Instruments and Hedging Activities (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) instrument | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) instrument | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |
Total return swap income | $ 2,788,000 | $ 1,975,000 | $ 4,772,000 | $ 4,020,000 |
Multifamily Housing Mortgage Revenue Bonds |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Bond subject to interest rate caps | 255,100,000 |  | 255,100,000 |  |
Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | $ 175,000,000.0 |  | $ 175,000,000.0 |  |
Interest rate | 2.30% |  | 2.30% |  |
Aggregate carrying value of the interest rate swap contracts | $ (3,400,000) |  | $ (3,400,000) |  | $ 800,000
Aggregate carrying value of the interest rate swap contracts, asset | 0 |  | 0 |  | 1,000,000.0
Aggregate carrying value of the interest rate swap contracts, liability | 3,400,000 |  | 3,400,000 |  | 200,000
Not Designated as Hedging Instrument | Total Return Swap, Callable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 255,100,000 |  | 255,100,000 |  |
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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