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Credit Risk Profile by Creditworthiness Category (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Commercial non real Estate $ 9,615 [1] $ 9,024 [1]
Commercial real estate 72,340 [1] 75,210 [1]
Superior Quality
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial non real Estate 56 [1] 58 [1]
Satisfactory
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial non real Estate 194 [1] 209 [1]
Commercial real estate 6,816 [1] 7,238 [1]
Grade 4 Acceptable Risk
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial non real Estate 3,879 [1] 4,148 [1]
Commercial real estate 24,090 [1] 24,844 [1]
Grade 5 Watch
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial non real Estate 2,510 [1] 2,433 [1]
Commercial real estate 25,790 [1] 23,762 [1]
Grade 6 Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial non real Estate 1,950 [1] 1,125 [1]
Commercial real estate 3,450 [1] 6,860 [1]
Grade 7 Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial non real Estate 919 [1] 957 [1]
Commercial real estate 10,944 [1] 11,256 [1]
Grade 8 Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial non real Estate 95 [1] 94 [1]
Commercial real estate $ 1,250 [1] $ 1,250 [1]
[1] Credit quality indicators are reviewed and updated as applicable on an ongoing basis in accordance with credit policies.