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Recorded Investment in Loans for Each Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal loan balance	$ 284,941	$ 280,086
Accrued interest receivable	1,093	1,127
Net deferred loan origination fees and costs	202	143
Recorded investment in loans	286,236	281,356
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal loan balance	108,097	116,338
Accrued interest receivable	444	463
Net deferred loan origination fees and costs	62	67
Recorded investment in loans	108,603	116,868
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal loan balance	9,607	9,910
Accrued interest receivable	48	60
Net deferred loan origination fees and costs	2	2
Recorded investment in loans	9,657	9,972
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal loan balance	11,746	6,963
Accrued interest receivable	29	16
Net deferred loan origination fees and costs	(12)	0
Recorded investment in loans	11,763	6,979
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal loan balance	68,731	57,680
Accrued interest receivable	188	160
Net deferred loan origination fees and costs	(17)	0
Recorded investment in loans	68,902	57,840
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal loan balance	18,612	20,722
Accrued interest receivable	53	64
Net deferred loan origination fees and costs	(10)	(10)
Recorded investment in loans	18,655	20,776
Home Equity and Second Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal loan balance	36,962	38,641
Accrued interest receivable	147	162
Net deferred loan origination fees and costs	177	84
Recorded investment in loans	37,286	38,887
Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal loan balance	31,186	29,832
Accrued interest receivable	184	202
Net deferred loan origination fees and costs	0	0
Recorded investment in loans	$ 31,370	$ 30,034