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Loans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Financing Receivable, Recorded Investment [Line Items]      
Total $ 366,827 $ 383,594 $ 380,752
Consumer and Other Loans [Member] | Demand Deposit Overdrafts [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total $ 187 $ 153