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Recorded Investment in Nonperforming Loans by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans $ 7,583 $ 7,401
Loans 90+ Days Past Due Still Accruing 289 363
Total Nonperforming Loans 10,040 11,515
Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 2,370 2,281
Loans 90+ Days Past Due Still Accruing 215 143
Total Nonperforming Loans 6,600 7,308
Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 125 5
Loans 90+ Days Past Due Still Accruing 0 38
Total Nonperforming Loans 462 528
Construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 403 247
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 284 247
Commercial Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 2,836 2,853
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 695 1,934
Commercial Business
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,776 1,928
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 36 256
Home Equity and Second Mortgage
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 73 87
Loans 90+ Days Past Due Still Accruing 56 159
Total Nonperforming Loans 1,405 876
Other Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 0 0
Loans 90+ Days Past Due Still Accruing 18 23
Total Nonperforming Loans 558 366
Nonperforming Financing Receivable
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 7,872 7,764
Nonperforming Financing Receivable | Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 2,585 2,424
Nonperforming Financing Receivable | Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 125 43
Nonperforming Financing Receivable | Construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 403 247
Nonperforming Financing Receivable | Commercial Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 2,836 2,853
Nonperforming Financing Receivable | Commercial Business
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 1,776 1,928
Nonperforming Financing Receivable | Home Equity and Second Mortgage
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 129 246
Nonperforming Financing Receivable | Other Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans $ 18 $ 23