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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2019
Receivables [Abstract] |  |  |  |
Impaired loans without a valuation allowance | $ 1,393 | $ 2,420 | $ 1,915 | $ 2,420
Impaired loans with a valuation allowance | 4,795 | 641 | 254 | 641
Total impaired loans | 6,188 | 3,061 | 2,169 | 3,061
Valuation allowance related to impaired loans | 766 | 197 | 59 | 197
Total non-accrual loans | 3,344 | 3,400 | 1,188 | 3,400
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0 | 0
Average investment in impaired loans | $ 4,314 | $ 3,120 | $ 2,135 | $ 2,649

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