Derivative Financial Instruments Derivative Financial Instruments (Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedges) (Detail) - Interest Rate Contract - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized loss at beginning of period	$ (4,408)	$ (4,695)	$ (4,062)	$ (3,971)
Amount reclassified from accumulated other comprehensive income to interest expense on deposits and junior subordinated debentures	571	553	1,460	1,567
Amount of loss recognized in other comprehensive income	(503)	418	(1,738)	(1,320)
Unrealized loss at end of period	$ (4,340)	$ (3,724)	$ (4,340)	$ (3,724)