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Recorded Investment in Loans by Risk Category (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 294,831 $ 286,236
Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 281,446 266,540
Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,160 4,041
Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 6,546 8,072
Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 4,679 7,583
Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 108,790 108,603
Residential | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 104,583 102,618
Residential | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 870 958
Residential | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,957 2,657
Residential | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,380 2,370
Residential | Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Land
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 10,141 9,657
Land | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 6,746 7,220
Land | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 17
Land | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 3,272 2,295
Land | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 123 125
Land | Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Construction
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 9,752 11,763
Construction | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 9,752 11,244
Construction | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 116
Construction | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Construction | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 403
Construction | Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Commercial Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 77,965 68,902
Commercial Real Estate | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 75,586 63,095
Commercial Real Estate | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 540 1,018
Commercial Real Estate | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 737 1,953
Commercial Real Estate | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,102 2,836
Commercial Real Estate | Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Commercial Business
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 20,082 18,655
Commercial Business | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 17,356 15,026
Commercial Business | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 436 1,354
Commercial Business | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 322 499
Commercial Business | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,968 1,776
Commercial Business | Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Home Equity and Second Mortgage
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 35,026 37,286
Home Equity and Second Mortgage | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 34,376 36,035
Home Equity and Second Mortgage | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 286 553
Home Equity and Second Mortgage | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 258 625
Home Equity and Second Mortgage | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 106 73
Home Equity and Second Mortgage | Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Other Consumer
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 33,075 31,370
Other Consumer | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 33,047 31,302
Other Consumer | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 28 25
Other Consumer | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 43
Other Consumer | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Other Consumer | Unlikely to be Collected Financing Receivable
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 0 $ 0