Derivative Financial Instruments (Schedule Of Amounts Related To Interest Rate Derivatives Designated As Hedges Of Fair Value) (Detail) (Commercial Loan/Lease Interest Rate Swaps [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Commercial Loan/Lease Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) included in interest income on loans	$ (632)	$ (874)	$ (1,947)	$ (2,848)
Amount of (gain) loss included in other non-interest expense	$ 31	$ (7)	$ 48	$ (10)