Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On The Consolidated Statement Of Income) (Details) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 401	[1]	$ 382	[1]
Interest Rate Contracts [Member] | Interest Income / (Expense) [Member] | Derivatives In Fair Value Hedging Relationships [Member]
Amount of Gain or (Loss) Recognized in Income on Derivative	709	[1]	866	[1]	1,461	[1]	1,907	[1]
Interest Rate Contracts [Member] | Interest Income / (Expense) [Member] | Derivatives In Cash Flow Hedging Relationships [Member]
Amount of Gain or (Loss) Recognized in Income on Derivative					787	[1]	775	[1]
Interest Rate Contracts [Member] | Other Income / (Expense) [Member] | Derivatives In Fair Value Hedging Relationships [Member]
Amount of Gain or (Loss) Recognized in Income on Derivative	222	[2]	695	[2]	369	[2]	1,317	[2]
Interest Rate Contracts [Member] | Other Income / (Expense) [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Amount of Gain or (Loss) Recognized in Income on Derivative	(1)	[3]	(302)	[3]	184	[3]	(301)	[3]
Mortgage Contracts [Member] | Mortgage Banking Revenue [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Amount of Gain or (Loss) Recognized in Income on Derivative	(77)		(38)		(21)		(224)
Derivatives In Fair Value Hedging Relationships [Member]
Amount of Gain or (Loss) Recognized in Income on Derivative	931		1,561		1,830		3,224
Derivatives In Cash Flow Hedging Relationships [Member]
Amount of Gain or (Loss) Recognized in Income on Derivative	401		382		787		775
Derivatives Not Designated As Hedging Instruments [Member]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ (78)		$ (340)		$ 163		$ (525)

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

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

[3] Includes the valuation differences between the customer and offsetting counterparty swaps. See Note 19 to the consolidated financial statements.