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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

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