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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized loss at beginning of period	$ (3,574)	$ (4,408)	$ (3,529)	$ (4,062)
Amount reclassified from accumulated other comprehensive income to interest expense on deposits and junior subordinated debentures	1,065	571	2,620	1,460
Amount of gain (loss) recognized in other comprehensive income	1,708	(503)	108	(1,738)
Unrealized loss at end of period	$ (801)	$ (4,340)	$ (801)	$ (4,340)