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Recorded Investment in Loans by Risk Category (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 289,009 $ 286,236
Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 274,897 266,540
Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,453 4,041
Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 6,280 8,072
Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 5,379 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 108,249 108,603
Residential | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 103,950 102,618
Residential | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 777 958
Residential | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,701 2,657
Residential | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,821 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 10,210 9,657
Land | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 6,782 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 3,301 2,295
Land | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 127 125
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 12,083 11,763
Construction | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 11,880 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 203 403
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 70,469 68,902
Commercial Real Estate | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 68,218 63,095
Commercial Real Estate | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 499 1,018
Commercial Real Estate | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 625 1,953
Commercial Real Estate | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,127 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 21,440 18,655
Commercial Business | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 18,344 15,026
Commercial Business | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 907 1,354
Commercial Business | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 413 499
Commercial Business | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,776 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 34,177 37,286
Home Equity and Second Mortgage | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 33,362 36,035
Home Equity and Second Mortgage | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 256 553
Home Equity and Second Mortgage | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 234 625
Home Equity and Second Mortgage | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 325 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 32,381 31,370
Other Consumer | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 32,361 31,302
Other Consumer | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 14 25
Other Consumer | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 6 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