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Recorded Investment in Nonperforming Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans $ 4,679 $ 7,583
Loans 90+ Days Past Due Still Accruing 483 289
Total Nonperforming Loans 6,816 10,040
Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,380 2,370
Loans 90+ Days Past Due Still Accruing 334 215
Total Nonperforming Loans 5,256 6,600
Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 123 125
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 380 462
Construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 0 403
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 0 284
Commercial Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,102 2,836
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 119 695
Commercial Business
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,968 1,776
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 226 36
Home Equity and Second Mortgage
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 106 73
Loans 90+ Days Past Due Still Accruing 149 56
Total Nonperforming Loans 626 1,405
Other Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 0 0
Loans 90+ Days Past Due Still Accruing 0 18
Total Nonperforming Loans 209 558
Nonperforming Financing Receivable
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 5,162 7,872
Nonperforming Financing Receivable | Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 1,714 2,585
Nonperforming Financing Receivable | Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 123 125
Nonperforming Financing Receivable | Construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 0 403
Nonperforming Financing Receivable | Commercial Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 1,102 2,836
Nonperforming Financing Receivable | Commercial Business
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 1,968 1,776
Nonperforming Financing Receivable | Home Equity and Second Mortgage
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 255 129
Nonperforming Financing Receivable | Other Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans $ 0 $ 18