Derivative Financial Instruments (Changes In Fair Value Of Non-Hedge Accounting Derivatives) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Net Swap Income	$ 512	$ 362	$ 997	$ 677
MTM (Loss) Gain and Fees	561	1,362	796	1,845
Net Impact	1,073	1,724	1,793	2,522
Visa swap [Member]
Derivative [Line Items]
Net Swap Income
MTM (Loss) Gain and Fees	(26)	(20)	(51)	(472)
Net Impact	(26)	(20)	(51)	(472)
Commercial loan interest rate derivatives, net [Member]
Derivative [Line Items]
Net Swap Income	512	362	997	677
MTM (Loss) Gain and Fees	479	1,321	687	2,100
Net Impact	991	1,683	1,684	2,777
Fed funds futures contracts [Member]
Derivative [Line Items]
Net Swap Income
MTM (Loss) Gain and Fees	108	61	160	217
Net Impact	$ 108	$ 61	$ 160	$ 217