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Loans - Schedule of Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]      
Impaired loans without a valuation allowance $ 924 $ 730  
Impaired loans with a valuation allowance 1,516 3,861  
Total impaired loans 2,440 4,591  
Valuation allowance related to impaired loans 516 865  
Total non-accrual loans 3,329 4,828  
Total loans past-due ninety days or more and still accruing    1  
Average investment in impaired loans 3,274 3,436 5,466
Interest income recognized on impaired loans 60 26 1,230
Interest income recognized on a cash basis on impaired loans $ 17 $ 21 $ 1,175