Investment Securities (Summary Of Sale Proceeds And Realized Gains And Losses And Recognition Of OTTI) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Investments [Line Items]
Gains	$ 3,347	$ 7,166	$ 10,681
Losses		(3,343)	(933)
OTTI Charge			(5,838)
Net	3,347	3,823	3,910
Agency Securities [Member]
Schedule of Investments [Line Items]
Gains	897	1,959	1,980
Losses			0
OTTI Charge			0
Net	897	1,959	1,980
MBS -GSE [Member]
Schedule of Investments [Line Items]
Gains	806	4,833	8,342
Losses	0		0
OTTI Charge	0		0
Net	806	4,833	8,342
Agency Notes [Member]
Schedule of Investments [Line Items]
Gains	0	0	18
Losses	0	0	0
OTTI Charge	0	0	0
Net	0	0	18
CMBS [Member]
Schedule of Investments [Line Items]
Gains	1,235		0
Losses
OTTI Charge			0
Net	1,235		0
Pooled Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Gains			341
Losses		(3,343)	(933)
OTTI Charge			(5,771)
Net		(3,343)	(6,363)
Equity Securities [Member]
Schedule of Investments [Line Items]
Gains	409	374	0
Losses			0
OTTI Charge			(67)
Net	$ 409	$ 374	$ (67)