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Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Junior Subordinated Notes, Total	$ 45,126	$ 44,384
Derivative Asset, Notional Amount	1,208,025	885,469
Short-term Debt, Total	866,500	541,500
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	200
Derivative Instruments, Gain (Loss) Reclassification from accumulated other comprehensive income (loss) to Income, Estimated Net Amount to be Transferred	600
Not Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount	18,000	18,000
Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount	323,500	326,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Asset, Notional Amount	866,500	541,500
Interest Rate Swap [Member]
Derivative Asset, Notional Amount	323,500	326,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount	18,000	18,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Asset, Notional Amount	866,500	541,500
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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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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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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