Derivative Financial Instruments (Rollforward of Amounts in Accumulated Other Comprehensive Income Related to Interest Rate Swaps Designated as Cash Flow Hedges) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Amount of (loss) gain recognized in other comprehensive income	$ (28,685)	$ (1,160)	$ 4,958
Designated as hedging instrument | Interest rate derivatives
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized gain at beginning of period	10,742	11,902
Amount reclassified from accumulated other comprehensive income to interest expense on deposits, other borrowings and junior subordinated debentures	(10,250)	(7,313)
Amount of (loss) gain recognized in other comprehensive income	(18,435)	6,153
Unrealized (loss) gain at end of period	$ (17,943)	$ 10,742	$ 11,902