Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On The Consolidated Statement Of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ (25)		$ (78)
Derivatives In Fair Value Hedging Relationships [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	774		931		1,566	[1]	1,830	[1]
Derivatives In Cash Flow Hedging Relationships [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	0		401		241		787
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative					132		163
Interest Income / (Expense) [Member] | Derivatives In Fair Value Hedging Relationships [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	552	[2]	709	[2]	1,173	[2]	1,461	[2]
Interest Income / (Expense) [Member] | Derivatives In Cash Flow Hedging Relationships [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	0	[2]	401	[2]	241	[2]	787	[2]
Other Income / (Expense) [Member] | Derivatives In Fair Value Hedging Relationships [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	222	[1]	222	[1]	393	[1]	369	[1]
Other Income / (Expense) [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	28	[3]	(1)	[3]	38	[3]	184	[3]
Mortgage Banking Revenue [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Mortgage Contracts [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ (53)		$ (77)		$ 94		$ (21)

[1] Amounts represent ineffectiveness on derivatives designated as fair value hedges.

[2] Amounts represent the net interest payments as stated in the contractual agreements.

[3] Includes the valuation differences between the customer and offsetting counterparty swaps.