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Aging of Recorded Investment in Loans by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due $ 6,711 $ 7,443
60-89 Days Past Due 1,003 1,220
Over 90 Days Past Due 2,326 2,852
Total Past Due 10,040 11,515
Current 276,196 269,841
Recorded investment in loans 286,236 281,356
Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 4,085 5,205
60-89 Days Past Due 871 1,068
Over 90 Days Past Due 1,644 1,035
Total Past Due 6,600 7,308
Current 102,003 109,560
Recorded investment in loans 108,603 116,868
Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 343 442
60-89 Days Past Due 0 43
Over 90 Days Past Due 119 43
Total Past Due 462 528
Current 9,195 9,444
Recorded investment in loans 9,657 9,972
Construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 171 0
60-89 Days Past Due 0 0
Over 90 Days Past Due 113 247
Total Past Due 284 247
Current 11,479 6,732
Recorded investment in loans 11,763 6,979
Commercial Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 360 676
60-89 Days Past Due 0 0
Over 90 Days Past Due 335 1,258
Total Past Due 695 1,934
Current 68,207 55,906
Recorded investment in loans 68,902 57,840
Commercial Business
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 36 256
60-89 Days Past Due 0 0
Over 90 Days Past Due 0 0
Total Past Due 36 256
Current 18,619 20,520
Recorded investment in loans 18,655 20,776
Home Equity and Second Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 1,206 558
60-89 Days Past Due 102 72
Over 90 Days Past Due 97 246
Total Past Due 1,405 876
Current 35,881 38,011
Recorded investment in loans 37,286 38,887
Other Consumer
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 510 306
60-89 Days Past Due 30 37
Over 90 Days Past Due 18 23
Total Past Due 558 366
Current 30,812 29,668
Recorded investment in loans $ 31,370 $ 30,034