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Derivatives - Notional and Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 297,000 | $ 318,000
Fair Value | 10,793 | 13,239
Bank of America, N.A. |  |
Derivative [Line Items] |  |
Notional Amount | 198,100 | 174,900
Fair Value | 9,135 | 8,523
Barclays Bank PLC |  |
Derivative [Line Items] |  |
Notional Amount | 98,900 | 115,300
Fair Value | 1,658 | 3,347
Citigroup Inc. |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Fair Value | 0 | 0
Credit Suisse International |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Fair Value | 0 | 0
Societe Generale |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 27,800
Fair Value | $ 0 | $ 1,369

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