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Recorded Investment in Loans for Each Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance $ 278,611 $ 280,086
Accrued interest receivable 994 1,127
Net deferred loan origination fees and costs 145 143
Recorded investment in loans 279,750 281,356
Individually evaluated for impairment 7,488 7,401
Collectively evaluated for impairment 272,262 273,955
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 279,750 281,356
Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 111,743 116,338
Accrued interest receivable 423 463
Net deferred loan origination fees and costs 69 67
Recorded investment in loans 112,235 116,868
Individually evaluated for impairment 2,370 2,281
Collectively evaluated for impairment 109,865 114,587
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 112,235 116,868
Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 9,779 9,910
Accrued interest receivable 45 60
Net deferred loan origination fees and costs 2 2
Recorded investment in loans 9,826 9,972
Individually evaluated for impairment 41 5
Collectively evaluated for impairment 9,785 9,967
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 9,826 9,972
Construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 7,967 6,963
Accrued interest receivable 13 16
Net deferred loan origination fees and costs (13) 0
Recorded investment in loans 7,967 6,979
Individually evaluated for impairment 265 247
Collectively evaluated for impairment 7,702 6,732
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 7,967 6,979
Commercial Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 60,054 57,680
Accrued interest receivable 155 160
Net deferred loan origination fees and costs (8) 0
Recorded investment in loans 60,201 57,840
Individually evaluated for impairment 2,730 2,853
Collectively evaluated for impairment 57,471 54,987
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 60,201 57,840
Commercial Business
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 19,981 20,722
Accrued interest receivable 59 64
Net deferred loan origination fees and costs (10) (10)
Recorded investment in loans 20,030 20,776
Individually evaluated for impairment 1,843 1,928
Collectively evaluated for impairment 18,187 18,848
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 20,030 20,776
Home Equity and Second Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 38,097 38,641
Accrued interest receivable 142 162
Net deferred loan origination fees and costs 105 84
Recorded investment in loans 38,344 38,887
Individually evaluated for impairment 239 87
Collectively evaluated for impairment 38,105 38,800
Acquired with deteriorated credit quality 0 0
Recorded investment in loans 38,344 38,887
Other Consumer
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal loan balance 30,990 29,832
Accrued interest receivable 157 202
Net deferred loan origination fees and costs 0 0
Recorded investment in loans 31,147 30,034
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 31,147 30,034
Acquired with deteriorated credit quality 0 0
Recorded investment in loans $ 31,147 $ 30,034