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	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Commercial Loan/Lease Interest Rate Swaps [Member]
Amount of gain (loss) included in interest income on loans	$ (969)	$ (1,318)	$ (1,974)	$ (2,734)
Amount of (gain) loss included in other non-interest expense	$ 6	$ (97)	$ (3)	$ (91)