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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2016
Receivables [Abstract]        
Impaired loans without a valuation allowance $ 1,099 $ 1,141 $ 1,042 $ 1,141
Impaired loans with a valuation allowance 694 711 1,169 711
Total impaired loans 1,793 1,852 2,211 1,852
Valuation allowance related to impaired loans 117 135 426 135
Total non-accrual loans 1,430 1,384 2,003 1,384
Total loans past-due ninety days or more and still accruing 0 0 0 0
Average investment in impaired loans $ 1,832 $ 1,684 $ 2,130 $ 1,802