Derivative Instruments (Summary Of The Effects Of Derivative Instruments On Consolidated Statements Of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total derivatives	$ 342	$ (34)
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative other non-interest income	139	117
Not Designated as Hedging Instrument [Member] | Credit Risk Participation Agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative other non-interest income	56	(2)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative other non-interest income	147	(140)
Not Designated as Hedging Instrument [Member] | Mortgage Loan Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative loan fees and sales	0	(20)
Not Designated as Hedging Instrument [Member] | Mortgage Loan Forward Sale Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative loan fees and sales	0	11
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total derivatives	125	88
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative interest and fees on loans	$ 125	$ 88