Derivative Financial Instruments (Changes In Fair Value Of Non Hedge Accounting Derivatives) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of non hedge accounting derivatives, Interest Income	$ 927	$ 708	$ 681
Fair value of non hedge accounting derivatives, MTM (Loss) Gain	(6)	(2,106)	(59)
Fair value of non hedge accounting derivatives, Net Impact	921	(1,398)	622
Visa Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of non hedge accounting derivatives, MTM (Loss) Gain	(153)	(330)	(194)
Fair value of non hedge accounting derivatives, Net Impact	(153)	(330)	(194)
Commercial Loan Interest Rate Derivatives, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of non hedge accounting derivatives, Interest Income	927	708	681
Fair value of non hedge accounting derivatives, MTM (Loss) Gain	1,962	686	135
Fair value of non hedge accounting derivatives, Net Impact	2,889	1,394	816
Fed Funds Futures Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of non hedge accounting derivatives, MTM (Loss) Gain	(1,815)	(2,462)
Fair value of non hedge accounting derivatives, Net Impact	$ (1,815)	$ (2,462)