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Recorded Investment in Nonperforming Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 4,596 $ 6,848
Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 3,541 4,691
Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 159 283
Construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 0
Commercial Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 46 780
Commercial Business
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 189 189
Home Equity and Second Mortgage
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 389 567
Other Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 272 338
Nonperforming Financing Receivable
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 4,390 5,259
Loans 90+ Days Past Due Still Accruing 70 227
Total Past Due 4,460 5,486
Nonperforming Financing Receivable | Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 945 1,533
Loans 90+ Days Past Due Still Accruing 68 180
Total Past Due 1,013 1,713
Nonperforming Financing Receivable | Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 113 120
Loans 90+ Days Past Due Still Accruing 0 0
Total Past Due 113 120
Nonperforming Financing Receivable | Construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 0 0
Loans 90+ Days Past Due Still Accruing 0 0
Total Past Due 0 0
Nonperforming Financing Receivable | Commercial Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,395 1,456
Loans 90+ Days Past Due Still Accruing 0 0
Total Past Due 1,395 1,456
Nonperforming Financing Receivable | Commercial Business
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,864 1,898
Loans 90+ Days Past Due Still Accruing 0 0
Total Past Due 1,864 1,898
Nonperforming Financing Receivable | Home Equity and Second Mortgage
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 73 252
Loans 90+ Days Past Due Still Accruing 0 39
Total Past Due 73 291
Nonperforming Financing Receivable | Other Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 0 0
Loans 90+ Days Past Due Still Accruing 2 8
Total Past Due $ 2 $ 8