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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Receivables [Abstract]            
Impaired loans without a valuation allowance $ 515 $ 1,257 $ 1,483 $ 515 $ 1,483 $ 1,257
Impaired loans with a valuation allowance 891 879 1,058 891 1,058 879
Total impaired loans 1,406 2,136 2,541 1,406 2,541 2,136
Valuation allowance related to impaired loans 125 330 465 125 465 330
Total non-accrual loans 1,132 2,041 2,294 1,132 2,294 2,041
Total loans past-due ninety days or more and still accruing 0 0 0 0 0 0
Average investment in impaired loans $ 1,499 $ 2,207 $ 2,924 $ 1,843 $ 2,609 $ 2,509