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Aging of Recorded Investment in Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due $ 4,046 $ 6,711
60-89 Days Past Due 887 1,003
Over 90 Days Past Due 1,883 2,326
Total Past Due 6,816 10,040
Current 288,015 276,196
Recorded investment in loans 294,831 286,236
Residential
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 3,392 4,085
60-89 Days Past Due 669 871
Over 90 Days Past Due 1,195 1,644
Total Past Due 5,256 6,600
Current 103,534 102,003
Recorded investment in loans 108,790 108,603
Land
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 257 343
60-89 Days Past Due 0 0
Over 90 Days Past Due 123 119
Total Past Due 380 462
Current 9,761 9,195
Recorded investment in loans 10,141 9,657
Construction
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 0 171
60-89 Days Past Due 0 0
Over 90 Days Past Due 0 113
Total Past Due 0 284
Current 9,752 11,479
Recorded investment in loans 9,752 11,763
Commercial Real Estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 0 360
60-89 Days Past Due 0 0
Over 90 Days Past Due 119 335
Total Past Due 119 695
Current 77,846 68,207
Recorded investment in loans 77,965 68,902
Commercial Business
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 0 36
60-89 Days Past Due 0 0
Over 90 Days Past Due 226 0
Total Past Due 226 36
Current 19,856 18,619
Recorded investment in loans 20,082 18,655
Home Equity and Second Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 208 1,206
60-89 Days Past Due 198 102
Over 90 Days Past Due 220 97
Total Past Due 626 1,405
Current 34,400 35,881
Recorded investment in loans 35,026 37,286
Other Consumer
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 189 510
60-89 Days Past Due 20 30
Over 90 Days Past Due 0 18
Total Past Due 209 558
Current 32,866 30,812
Recorded investment in loans $ 33,075 $ 31,370