Derivative Instruments (Summary of the Effects of Derivative Instruments on Consolidated Statements of Income) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest Rate Swaps [Member] | Derivatives in fair value hedging relationships [Member]
Derivative interest and fees on loans	$ (117)	$ (309)	$ 70	$ (390)
Interest Rate Swaps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative other non-interest income	167	269	556	459
Interest Rate Caps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative other non-interest income		32		32
Credit Risk Participation Agreements [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative other non-interest income	29	8	35	13
Foreign Exchange (Forward Contracts) [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative other non-interest income	(11)	138	153	414
Mortgage Loan Commitments [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative loan fees and sales	(15)	156	29	240
Mortgage Loan Forward Sale Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative loan fees and sales	(19)	(259)	(432)	(361)
Derivatives in fair value hedging relationships [Member]
Total derivatives	(117)	(309)	70	(390)
Derivatives Not Designated As Hedging Instruments [Member]
Total derivatives	$ 151	$ 344	$ 341	$ 797