Goodwill and Intangibles (Summary of Other Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Gross Intangible Assets	$ 9,255	$ 9,235
Accumulated Amortization	(3,838)	(3,096)
Net Intangible Assets	5,417	6,139
Core Deposits (Member)
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Gross Intangible Assets	4,370	4,370
Accumulated Amortization	(1,863)	(1,393)
Net Intangible Assets	2,507	2,977
Other Intangible Assets (Member)
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Gross Intangible Assets	4,885	4,865
Accumulated Amortization	(1,975)	(1,703)
Net Intangible Assets	$ 2,910	$ 3,162