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Recorded Investment in Loans for Each Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance $ 285,369 $ 280,086
Accrued interest receivable 1,068 1,127
Net deferred loan origination fees and costs 189 143
Recorded investment in loans 286,626 281,356
Individually evaluated for impairment 7,992 7,401
Collectively evaluated for impairment 278,634 273,955
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 286,626 281,356
Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 111,594 116,338
Accrued interest receivable 447 463
Net deferred loan origination fees and costs 64 67
Recorded investment in loans 112,105 116,868
Individually evaluated for impairment 2,698 2,281
Collectively evaluated for impairment 109,407 114,587
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 112,105 116,868
Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 9,663 9,910
Accrued interest receivable 42 60
Net deferred loan origination fees and costs 2 2
Recorded investment in loans 9,707 9,972
Individually evaluated for impairment 4 5
Collectively evaluated for impairment 9,703 9,967
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 9,707 9,972
Construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 11,878 6,963
Accrued interest receivable 31 16
Net deferred loan origination fees and costs (13) 0
Recorded investment in loans 11,896 6,979
Individually evaluated for impairment 394 247
Collectively evaluated for impairment 11,502 6,732
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 11,896 6,979
Commercial Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 63,944 57,680
Accrued interest receivable 170 160
Net deferred loan origination fees and costs (8) 0
Recorded investment in loans 64,106 57,840
Individually evaluated for impairment 2,986 2,853
Collectively evaluated for impairment 61,120 54,987
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 64,106 57,840
Commercial Business
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 19,146 20,722
Accrued interest receivable 56 64
Net deferred loan origination fees and costs (10) (10)
Recorded investment in loans 19,192 20,776
Individually evaluated for impairment 1,809 1,928
Collectively evaluated for impairment 17,383 18,848
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 19,192 20,776
Home Equity and Second Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 37,348 38,641
Accrued interest receivable 142 162
Net deferred loan origination fees and costs 154 84
Recorded investment in loans 37,644 38,887
Individually evaluated for impairment 101 87
Collectively evaluated for impairment 37,543 38,800
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 37,644 38,887
Other Consumer
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 31,796 29,832
Accrued interest receivable 180 202
Net deferred loan origination fees and costs 0 0
Recorded investment in loans 31,976 30,034
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 31,976 30,034
Acquired with deteriorated credit quality 0 0
Recorded investment in loans $ 31,976 $ 30,034