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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]      
Impaired loans without a valuation allowance $ 1,257 $ 675  
Impaired loans with a valuation allowance 879 1,168  
Total impaired loans 2,136 1,843  
Valuation allowance related to impaired loans 330 387  
Total non-accrual loans 2,041 1,705  
Total loans past-due ninety days or more and still accruing 0 0 $ 0
Average investment in impaired loans 2,509 1,929 3,274
Interest income recognized on impaired loans 96 87 60
Interest income recognized on a cash basis on impaired loans $ 60 $ 51 $ 17