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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Receivables [Abstract] |  |  |  |  |  |
Impaired loans without a valuation allowance | $ 1,841 | $ 1,131 | $ 1,294 | $ 1,841 | $ 1,294 | $ 1,131
Impaired loans with a valuation allowance | 970 | 614 | 685 | 970 | 685 | 614
Total impaired loans | 2,811 | 1,745 | 1,979 | 2,811 | 1,979 | 1,745
Valuation allowance related to impaired loans | 148 | 106 | 123 | 148 | 123 | 106
Total non-accrual loans | 483 | 1,003 | 1,729 | 483 | 1,729 | 1,003
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0 | 0 | 0 | 0
Average investment in impaired loans | $ 2,158 | $ 2,160 | $ 1,804 | $ 1,765 | $ 1,793 | $ 1,885

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