Goodwill And Other Intangible Assets (Schedule Of Definite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 47,130	$ 47,094
Accumulated Amortization	(23,028)	(21,739)
Net Carrying Amount	24,102	25,355
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	45,406	45,406
Accumulated Amortization	(22,610)	(21,385)
Net Carrying Amount	22,796	24,021
Customer Relationship Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,348	1,348
Accumulated Amortization	(225)	(160)
Net Carrying Amount	1,123	1,188
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	376	340
Accumulated Amortization	(193)	(194)
Net Carrying Amount	$ 183	$ 146