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Recorded Investment in Loans by Risk Category (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 304,021 $ 294,478
Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 286,747 279,249
Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 7,866 4,066
Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 5,018 5,904
Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 4,390 5,259
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 105,783 107,508
Residential | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 103,761 103,594
Residential | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 183 756
Residential | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 894 1,625
Residential | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 945 1,533
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 9,985 10,360
Land | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 6,816 7,096
Land | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
Land | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 3,056 3,144
Land | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 113 120
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 9,015 9,018
Construction | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 9,015 9,018
Construction | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 0
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 0
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 78,719 76,666
Commercial Real Estate | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 72,009 71,893
Commercial Real Estate | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 4,633 2,627
Commercial Real Estate | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 682 690
Commercial Real Estate | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,395 1,456
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 28,422 22,003
Commercial Business | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 23,643 19,328
Commercial Business | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,915 458
Commercial Business | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 319
Commercial Business | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,864 1,898
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 37,352 35,269
Home Equity and Second Mortgage | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 36,812 34,693
Home Equity and Second Mortgage | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 98 198
Home Equity and Second Mortgage | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 369 126
Home Equity and Second Mortgage | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 73 252
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 34,745 33,654
Other Consumer | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 34,691 33,627
Other Consumer | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 37 27
Other Consumer | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 17 0
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