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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Receivables [Abstract] |  |  |  |  |  |
Impaired loans without a valuation allowance | $ 3,063 | $ 5,172 | $ 2,695 | $ 3,063 | $ 2,695 | $ 5,172
Impaired loans with a valuation allowance | 8,976 | 9,360 | 9,872 | 8,976 | 9,872 | 9,360
Total impaired loans | 12,039 | 14,532 | 12,567 | 12,039 | 12,567 | 14,532
Valuation allowance related to impaired loans | 1,156 | 1,657 | 1,170 | 1,156 | 1,170 | 1,657
Total non-accrual loans | 7,031 | 9,404 | 8,473 | 7,031 | 8,473 | 9,404
Total loans past-due ninety days or more and still accruing |  | 0 | 0 |  | 0 | 0
Average investment in impaired loans | $ 12,206 | $ 14,868 | $ 8,352 | $ 12,836 | $ 6,333 | $ 10,234

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