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Recorded Investment in Loans by Risk Category (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans $ 293,152 $ 294,478
Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 278,662 279,249
Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 4,015 4,066
Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 5,726 5,904
Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 4,749 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 106,703 107,508
Residential | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 103,842 103,594
Residential | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 424 756
Residential | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,314 1,625
Residential | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,123 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 10,120 10,360
Land | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 6,915 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 3,087 3,144
Land | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 118 120
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 9,683 9,018
Construction | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 9,683 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 77,898 76,666
Commercial Real Estate | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 72,958 71,893
Commercial Real Estate | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 2,709 2,627
Commercial Real Estate | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 807 690
Commercial Real Estate | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,424 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 21,244 22,003
Commercial Business | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 18,262 19,328
Commercial Business | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 768 458
Commercial Business | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 316 319
Commercial Business | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 1,898 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 34,955 35,269
Home Equity and Second Mortgage | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 34,468 34,693
Home Equity and Second Mortgage | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 99 198
Home Equity and Second Mortgage | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 202 126
Home Equity and Second Mortgage | Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 186 252
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 32,549 33,654
Other Consumer | Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 32,534 33,627
Other Consumer | Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 15 27
Other Consumer | Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Recorded investment in loans 0 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