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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Receivables [Abstract]            
Impaired loans without a valuation allowance $ 1,294 $ 1,141 $ 515 $ 1,294 $ 515 $ 1,141
Impaired loans with a valuation allowance 685 711 891 685 891 711
Total impaired loans 1,979 1,852 1,406 1,979 1,406 1,852
Valuation allowance related to impaired loans 123 135 125 123 125 135
Total non-accrual loans 1,729 1,384 1,132 1,729 1,132 1,384
Total loans past-due ninety days or more and still accruing 0 0 0 0 0 0
Average investment in impaired loans $ 1,804 $ 1,684 $ 1,499 $ 1,793 $ 1,843 $ 1,802