Investment Securities (Summary Of Sale Proceeds And Realized Gains And Losses And Recognition Of OTTI) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Investments [Line Items]
Gains	$ 810		$ 3,347	$ 7,166
Losses				(3,343)
OTTI Charges
Net	810		3,347	3,823
Agency Securities [Member]
Schedule of Investments [Line Items]
Gains	4		897	1,959
Losses
OTTI Charges
Net	4		897	1,959
Pooled Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Gains
Losses				(3,343)
OTTI Charges
Net				(3,343)
Equity Securities [Member]
Schedule of Investments [Line Items]
Gains			409	374
Losses
OTTI Charges
Net			409	374
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Gains	806		806	4,833
Losses	0
OTTI Charges	0
Net	806		806	4,833
CMBS [Member]
Schedule of Investments [Line Items]
Gains			1,235	0
Losses
OTTI Charges
Net			$ 1,235