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Derivative Financial Instruments - Interest Swap Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 829,784 |  | $ 840,646
Fair Value | (80,850) |  | (37,939)
Interest expense | 21,226 | $ 18,755 |
Interest rate swaps | Derivatives designated as hedging instruments |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 513,034 |  | $ 515,646
Weighted Average Remaining Maturity (years) | 5 years |  | 5 years 3 months 18 days
Fair Value | $ (51,665) |  | $ (24,357)
Weighted-Average Rate | 2.80% |  | 2.80%
Cash collateral received |  |  | $ 81,300
Cash collateral pledged |  |  | 42,300
Loans | Derivatives designated as hedging instruments |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Fair Value | $ 44,586 |  | 21,440
Loans | Interest rate swaps | Derivatives designated as hedging instruments |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 424,834 |  | $ 427,446
Weighted Average Remaining Maturity (years) | 5 years 3 months 18 days |  | 5 years 6 months
Fair Value | $ (44,872) |  | $ (21,551)
Weighted-Average Rate | 2.86% |  | 2.86%
Securities available-for-sale | Derivatives designated as hedging instruments |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Fair Value | $ 6,790 |  | $ 2,802
Securities available-for-sale | Interest rate swaps | Derivatives designated as hedging instruments |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 88,200 |  | $ 88,200
Weighted Average Remaining Maturity (years) | 3 years 10 months 24 days |  | 4 years 1 month 6 days
Fair Value | $ (6,793) |  | $ (2,806)
Weighted-Average Rate | 2.54% |  | 2.54%
3-month LIBOR | Interest rate swaps | Derivatives designated as hedging instruments |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 110,000 |  | $ 110,000
Weighted Average Remaining Maturity (years) | 6 years 9 months 18 days |  | 7 years 1 month 6 days
Fair Value | $ (17,509) |  | $ (8,390)
Derivative, variable interest rate | 2.88% |  | 2.88%
1-month LIBOR | Interest rate swaps | Derivatives designated as hedging instruments |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 100,000 |  | $ 100,000
Weighted Average Remaining Maturity (years) | 3 years 8 months 12 days |  | 4 years
Fair Value | $ (9,378) |  | $ (5,040)
Derivative, variable interest rate | 2.88% |  | 2.88%

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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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