Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On The Consolidated Statements Of Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Derivatives In Fair Value Hedging Relationships [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 2,791	[1]	$ 3,830	[1]
Derivatives In Cash Flow Hedging Relationships [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	241		1,593
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	404		44
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	2,114		2,938
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	241		1,593
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	677	[2]	892	[2]
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	143	[3]	82	[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	$ 261		$ (38)

[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.