Derivative Financial Instruments (Rollforward of Amounts in Accumulated Other Comprehensive Income Related to Interest Rate Swaps Designated as Cash Flow Hedges) (Details) - Designated as hedging instrument - Interest rate derivatives - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized (loss) gain at beginning of period	$ (17,943)	$ 10,742
Amount reclassified from accumulated other comprehensive income to interest expense on deposits, other borrowings and junior subordinated debentures	18,471	(10,250)
Amount of loss recognized in other comprehensive income	(32,061)	(18,435)
Unrealized loss at end of period	$ (31,533)	$ (17,943)