Derivative Financial Instruments (Schedule Of Amounts Related To Interest Rate Derivatives Designated As Hedges Of Fair Value) (Details) (Commercial Loan/Lease Interest Rate Swaps [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Commercial Loan/Lease Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) included in interest income on loans	$ (667)	$ (1,005)
Amount of (gain) loss included in other non-interest expense	$ (12)	$ (9)