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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020
Receivables [Abstract] |  |  |  |
Impaired loans without a valuation allowance | $ 6,604 | $ 5,172 | $ 1,393 | $ 5,172
Impaired loans with a valuation allowance | 5,532 | 9,360 | 4,795 | 9,360
Total impaired loans | 12,136 | 14,532 | 6,188 | 14,532
Valuation allowance related to impaired loans | 1,109 | 1,657 | 766 | 1,657
Total non-accrual loans | 8,139 | 9,404 | 3,344 | 9,404
Total loans past-due ninety days or more and still accruing |  | 0 | 0 | 0
Average investment in impaired loans | $ 13,467 | $ 14,868 | $ 4,314 | $ 10,234

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