Goodwill And Other Intangible Assets (Schedule Of Definite-Lived Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Goodwill [Line Items]
Gross Carrying Amount	$ 47,437	$ 47,094
Accumulated Amortization	(24,324)	(21,739)
Net Carrying Amount	23,113	25,355
Core Deposit Intangibles [Member]
Goodwill [Line Items]
Gross Carrying Amount	45,406	45,406
Accumulated Amortization	(23,834)	(21,385)
Net Carrying Amount	21,572	24,021
Customer Relationship Intangible Asset [Member]
Goodwill [Line Items]
Gross Carrying Amount	1,348	1,348
Accumulated Amortization	(289)	(160)
Net Carrying Amount	1,059	1,188
Mortgage Servicing Rights [Member]
Goodwill [Line Items]
Gross Carrying Amount	683	340
Accumulated Amortization	(201)	(194)
Net Carrying Amount	$ 482	$ 146