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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Receivables [Abstract] |  |  |  |  |  |
Impaired loans without a valuation allowance | $ 5,134 | $ 2,420 | $ 1,914 | $ 5,134 | $ 1,914 | $ 2,420
Impaired loans with a valuation allowance | 10,125 | 641 | 1,314 | 10,125 | 1,314 | 641
Total impaired loans | 15,259 | 3,061 | 3,228 | 15,259 | 3,228 | 3,061
Valuation allowance related to impaired loans | 1,198 | 197 | 187 | 1,198 | 187 | 197
Total non-accrual loans | 7,870 | 3,400 | 3,275 | 7,870 | 3,275 | 3,400
Total loans past-due ninety days or more and still accruing | 408 | 0 | 0 | 408 | 0 | 0
Average investment in impaired loans | $ 13,517 | $ 3,120 | $ 3,141 | $ 8,613 | $ 2,492 | $ 2,649

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