Derivative Financial Instruments (Rollforward of Amounts in Accumulated Other Comprehensive Income Related to Interest Rate Swaps Designated as Cash Flow Hedges) (Details) - Interest Rate Contract - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized loss at beginning of period	$ (3,529)	$ (4,062)
Amount reclassified from accumulated other comprehensive income to interest expense on deposits and junior subordinated debentures	3,120	2,082
Amount of gain (loss) recognized in other comprehensive income	7,353	(1,549)
Unrealized gain (loss) at end of period	$ 6,944	$ (3,529)