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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Receivables [Abstract] |  |  |
Impaired loans without a valuation allowance | $ 1,228 | $ 5,172 |
Impaired loans with a valuation allowance | 10,711 | 9,360 |
Total impaired loans | 11,939 | 14,532 |
Valuation allowance related to impaired loans | 2,184 | 1,657 |
Total nonaccrual loans | 8,076 | 9,404 |
Total loans past-due ninety days or more and still accruing | 0 | 0 |
Average investment in impaired loans | 12,247 | 10,232 | $ 2,649
Interest income recognized on impaired loans | 292 | 269 | 118
Interest income recognized on a cash basis on impaired loans | $ 188 | $ 135 | $ 9

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