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, 2012	Mar. 31, 2011
Derivatives In Fair Value Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total derivatives	$ 88	$ 187
Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total derivatives	(34)	190
Interest Rate Swaps [Member] | Derivatives In Fair Value Hedging Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative interest and fees on loans	88	187
Interest Rate Swaps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative other non-interest income	117	389
Interest Rate Caps [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative other non-interest income
Credit Risk Participation Agreements [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative other non-interest income	(2)	6
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative other non-interest income	(140)	164
Mortgage Loan Commitments [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative loan fees and sales	(20)	44
Mortgage Loan Forward Sale Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative loan fees and sales	$ 11	$ (413)