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Recorded Investment in Nonperforming Loans by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans $ 5,820 $ 7,583
Loans 90+ Days Past Due Still Accruing 292 289
Total Nonperforming Loans 8,362 10,040
Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,974 2,370
Loans 90+ Days Past Due Still Accruing 219 215
Total Nonperforming Loans 5,923 6,600
Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 130 125
Loans 90+ Days Past Due Still Accruing 11 0
Total Nonperforming Loans 458 462
Construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 260 403
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 111 284
Commercial Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,406 2,836
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 637 695
Commercial Business
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 1,776 1,776
Loans 90+ Days Past Due Still Accruing 0 0
Total Nonperforming Loans 237 36
Home Equity and Second Mortgage
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 274 73
Loans 90+ Days Past Due Still Accruing 53 56
Total Nonperforming Loans 674 1,405
Other Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual Loans 0 0
Loans 90+ Days Past Due Still Accruing 9 18
Total Nonperforming Loans 322 558
Nonperforming Financing Receivable
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 6,112 7,872
Nonperforming Financing Receivable | Residential
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 2,193 2,585
Nonperforming Financing Receivable | Land
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 141 125
Nonperforming Financing Receivable | Construction
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 260 403
Nonperforming Financing Receivable | Commercial Real Estate
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 1,406 2,836
Nonperforming Financing Receivable | Commercial Business
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 1,776 1,776
Nonperforming Financing Receivable | Home Equity and Second Mortgage
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans 327 129
Nonperforming Financing Receivable | Other Consumer
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Nonperforming Loans $ 9 $ 18