Derivative Financial Instruments (Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Derivatives Designated As Cash Flow Hedges) (Detail) (Interest Rate Contract [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Rate Contract [Member]
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized loss at beginning of period	$ (5,030)	$ (9,901)	$ (8,673)	$ (11,633)
Amount reclassified from accumulated other comprehensive income to interest expense on junior subordinated debentures	1,507	1,471	4,629	4,324
Amount of loss recognized in other comprehensive income	(859)	(1,764)	(338)	(2,885)
Unrealized loss at end of period	$ (4,382)	$ (10,194)	$ (4,382)	$ (10,194)