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Recorded Investment in Loans by Risk Category (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 279,750 $ 281,356
Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 112,235 116,868
Land
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 9,826 9,972
Construction
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 7,967 6,979
Commercial Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 60,201 57,840
Commercial Business
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 20,030 20,776
Home Equity and Second Mortgage
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 38,344 38,887
Other Consumer
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 31,147 30,034
Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 255,133 258,826
Pass | Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 106,102 113,037
Pass | Land
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 7,388 7,578
Pass | Construction
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 7,386 6,217
Pass | Commercial Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 49,427 46,544
Pass | Commercial Business
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 15,957 16,961
Pass | Home Equity and Second Mortgage
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 37,833 38,513
Pass | Other Consumer
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 31,040 29,976
Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 9,407 8,385
Special Mention | Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,860 862
Special Mention | Land
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 252 255
Special Mention | Construction
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 156 307
Special Mention | Commercial Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 5,264 5,392
Special Mention | Commercial Business
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,799 1,462
Special Mention | Home Equity and Second Mortgage
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 17 63
Special Mention | Other Consumer
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 59 44
Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 7,722 6,744
Substandard | Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,903 688
Substandard | Land
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,145 2,134
Substandard | Construction
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 160 208
Substandard | Commercial Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,780 3,051
Substandard | Commercial Business
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 431 425
Substandard | Home Equity and Second Mortgage
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 255 224
Substandard | Other Consumer
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 48 14
Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 7,488 7,401
Doubtful | Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,370 2,281
Doubtful | Land
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 41 5
Doubtful | Construction
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 265 247
Doubtful | Commercial Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,730 2,853
Doubtful | Commercial Business
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,843 1,928
Doubtful | Home Equity and Second Mortgage
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 239 87
Doubtful | Other Consumer
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Unlikely to be Collected Financing Receivable | Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Unlikely to be Collected Financing Receivable | Land
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Unlikely to be Collected Financing Receivable | Construction
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Unlikely to be Collected Financing Receivable | Commercial Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Unlikely to be Collected Financing Receivable | Commercial Business
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Unlikely to be Collected Financing Receivable | Home Equity and Second Mortgage
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Unlikely to be Collected Financing Receivable | Other Consumer
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 0 $ 0