11. Income Taxes (Detail) - Table of Deferred Tax Assets (Liabilities) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Allowance for loan and lease losses	$ 2,637	$ 3,157
Other real estate owned	1,146	891
Deferred compensation	2,006	1,962
Other	137	181
Premises and equipment		19
Total deferred tax assets	5,926	6,210
Deferred tax liabilities:
Core deposit intangible		(82)
Unrealized gains on available-for-sale investment securities	(2,857)	(2,372)
Future liability of state deferred tax assets	(399)	(355)
Deferred loan costs	(219)	(256)
Federal Home Loan Bank stock dividends	(211)	(211)
Premises and equipment	(245)
Total deferred tax liabilities	(3,931)	(3,276)
Net deferred tax assets	$ 1,995	$ 2,934