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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Receivables [Abstract] |  |  |  |  |  |
Impaired loans without a valuation allowance | $ 2,461 | $ 5,172 | $ 5,134 | $ 2,461 | $ 5,134 | $ 5,172
Impaired loans with a valuation allowance | 9,388 | 9,360 | 10,125 | 9,388 | 10,125 | 9,360
Total impaired loans | 11,849 | 14,532 | 15,259 | 11,849 | 15,259 | 14,532
Valuation allowance related to impaired loans | 2,400 | 1,657 | 1,198 | 2,400 | 1,198 | 1,657
Total non-accrual loans | 6,248 | 9,404 | 7,870 | 6,248 | 7,870 | 9,404
Total loans past-due ninety days or more and still accruing |  | 0 | 0 |  | 0 | 0
Average investment in impaired loans | $ 11,639 | $ 14,868 | $ 13,517 | $ 12,360 | $ 8,613 | $ 10,234

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