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Derivative Financial Instruments (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) item
Junior Subordinated Notes, Total | $ 44,384 | $ 41,849
Derivative Asset, Notional Amount | 885,469 | 745,619
Short-term Debt, Total | 541,500 | 441,500
Derivative, Net Hedge Ineffectiveness Gain (Loss) | 0 | 0
Derivative Instruments, Gain (Loss) Reclassification from accumulated other comprehensive income (loss) to Income, Estimated Net Amount to be Transferred | 500 |
Not Designated as Hedging Instrument [Member] |  |
Derivative Asset, Notional Amount | 18,000 | 36,300
Designated as Hedging Instrument [Member] |  |
Derivative Asset, Notional Amount | 326,000 | 267,800
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |
Derivative Asset, Notional Amount | $ 541,500 | $ 441,500
Derivative, Number of Instruments Held, Total | item | 0 | 0
Interest Rate Swap [Member] |  |
Derivative Asset, Notional Amount | $ 326,000 | $ 286,100
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |
Derivative Asset, Notional Amount | 18,000 | 36,321
Floating Rate Junior Subordinated Debentures [Member] |  |
Derivative, Amount of Hedged Item | 18,000 | 18,000
Junior Subordinated Notes, Total | $ 61,900 | $ 61,900

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