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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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Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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Nominal or face amount used to calculate payments on the derivative asset.

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Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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The number of derivative instruments of a particular group held by the entity.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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