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Interest Rate Contracts - Summary of Interest Rate Swaps (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020 | Jul. 01, 2020 | Mar. 10, 2020 | Jul. 09, 2015
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Derivative [Line Items] |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ (37,600,000) | $ (54,000,000.0) |  |  |
Interest Rate Swap, Effective March 10, 2020 - $150,000 Notional Amount, Interest Rate 0.83% |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest strike rate (percent) | 0.83% |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ (216,000) | (2,963,000) |  |  |
Derivative notional amount | $ 150,000,000 | 150,000,000 |  | $ 150,000,000.0 |
Interest Rate Swap, Effective March 10, 2020 - $100,000 Notional Amount, Interest Rate 0.84% |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest strike rate (percent) | 0.84% |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ (197,000) | (2,023,000) |  |  |
Derivative notional amount | $ 100,000,000 | 100,000,000 |  |  |
Interest Rate Swap, Effective March 10, 2020 - $75,000 Notional Amount, Interest Rate 0.86% |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest strike rate (percent) | 0.86% |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ (201,000) | (1,580,000) |  |  |
Derivative notional amount | $ 75,000,000 | 75,000,000 |  | 75,000,000.0 |
Interest Rate Swap Effective Date July 1, 2020,$125,000 Notional Amount, Interest Rate 2.82% |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest strike rate (percent) | 2.82% |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ (10,816,000) | (13,896,000) |  |  |
Derivative notional amount | $ 125,000,000 | 125,000,000 |  | $ 100,000,000.0 |
Interest Rate Swap Effective Date July 1, 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest strike rate (percent) | 2.82% |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ (8,690,000) | (11,140,000) |  |  |
Derivative notional amount | $ 100,000,000 | 100,000,000 |  |  |
Interest Rate Swap Effective Date July 1, 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest strike rate (percent) | 2.83% |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ (8,684,000) | (11,148,000) |  |  |
Derivative notional amount | $ 100,000,000 | 100,000,000 |  |  |
Interest Rate Swap Effective Date July 1, 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest strike rate (percent) | 2.84% |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ (8,755,000) | (11,225,000) |  |  |
Derivative notional amount | 100,000,000 | 100,000,000 |  |  |
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | (37,559,000) | (53,975,000) |  |  |
Derivative notional amount | $ 750,000,000 | $ 750,000,000 | $ 425,000,000.0 |  | $ 425,000,000.0

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