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Credit Risk Profile by Creditworthiness Category (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate $ 10,392 [1] $ 12,939 [1]
Commercial real estate 87,309 [1] 97,547 [1]
Grade 1 Minimal Risk
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate 58 [1] 52 [1]
Grade 2 Low Risk
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate   223 [1]
Grade 3 Moderate Risk
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate 263 [1] 363 [1]
Commercial real estate 7,572 [1] 9,242 [1]
Grade 4 Acceptable Risk
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate 4,952 [1] 6,458 [1]
Commercial real estate 32,639 [1] 39,168 [1]
Grade 5 Watch
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate 1,762 [1] 1,778 [1]
Commercial real estate 21,683 [1] 21,263 [1]
Grade 6 Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate 1,790 [1] 1,933 [1]
Commercial real estate 8,227 [1] 9,890 [1]
Grade 7 Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate 1,471 [1] 1,926 [1]
Commercial real estate 15,938 [1] 17,984 [1]
Grade 8 Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial Non Real Estate 96 [1] 206 [1]
Commercial real estate $ 1,250 [1]  
[1] Credit quality indicators are reviewed and updated as applicable on an ongoing basis in accordance with credit policies.