3. Fair Value Meaurements (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Unpaid Principal Balance, Impaired Loans Measured At Fair Value	$ 1,664,000	$ 14,543,000
Other Real Estate	13,237,000	9,168,000
Impaired Financing Receivable [Member]
Asset Net of Write-Down, Unpaid Principal Balance	1,418,000	13,055,000
Asset Impairment Charges	246,000	1,488,000
Other Real Estate Owned [Member]
Asset Net of Write-Down, Unpaid Principal Balance	12,237,000	8,190,000
Asset Impairment Charges	$ 1,000,000	$ 978,000