Goodwill And Other Intangible Assets (Schedule Of Gross Carrying Amount And Accumulated Amortization Of Other Intangible Assets) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Gross Carrying Amount	$ 72,910	$ 56,976
Accumulated Amortization and Impairment	(36,612)	(30,798)
Net Carrying Amount	36,298	26,178
Core Deposit [Member]
Gross Carrying Amount	39,265	26,810
Accumulated Amortization and Impairment	(18,539)	(14,646)
Net Carrying Amount	20,726	12,164
Customer Business Relationships [Member]
Gross Carrying Amount	25,611	25,753
Accumulated Amortization and Impairment	(15,867)	(14,581)
Net Carrying Amount	9,744	11,172
Customer Trust Relationships [Member]
Gross Carrying Amount	3,621
Accumulated Amortization and Impairment	(334)
Net Carrying Amount	3,287
Customer Loan Relationships [Member]
Gross Carrying Amount	4,413	4,413
Accumulated Amortization and Impairment	(1,872)	(1,571)
Net Carrying Amount	$ 2,541	$ 2,842