Goodwill And Other Intangible Assets (Schedule Of Gross Carrying Amount And Accumulated Amortization Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73,197	$ 56,976
Accumulated Amortization	(39,573)	(30,798)
Net Carrying Amount	33,624	26,178
Core Deposit Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	39,265	26,810
Accumulated Amortization	(20,815)	(14,646)
Net Carrying Amount	18,450	12,164
Customer Business Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,897	25,753
Accumulated Amortization	(16,312)	(14,581)
Net Carrying Amount	9,585	11,172
Customer Trust Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,622
Accumulated Amortization	(474)
Net Carrying Amount	3,148
Customer Loan Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,413	4,413
Accumulated Amortization	(1,972)	(1,571)
Net Carrying Amount	$ 2,441	$ 2,842