Components of Deferred Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012
Assets
Allowance for loan losses	$ 7,245	$ 6,816
Deferred compensation	3,090	3,170
Business tax and AMT credit carryovers	7,841	7,593
Capital loss carryover	832	557
Net operating loss carryover	2,582	2,822
Goodwill impairment	4,012	3,598
Other	2,150	2,063
Total assets	27,752	26,619
Liabilities
Unrealized gain on securities available for sale	(886)	(1,600)
Depreciation and amortization	(1,554)	(1,197)
FHLB stock	(564)	(566)
State income tax	(1,351)	(1,547)
Loan fees	(511)	(672)
Investments in limited partnerships	(2,258)	(2,301)
Mortgage servicing rights	(1,073)	(650)
Other	(334)	(338)
Total liabilities	(8,531)	(8,871)
Valuation Allowance
Beginning balance	(1,335)	(1,835)
Increase during period	(500)
Ending balance	(1,835)	(1,835)
Net deferred tax asset	$ 17,386	$ 15,913