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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2022
Receivables [Abstract] |  |  |  |
Impaired loans without a valuation allowance | $ 4,194 | $ 5,835 | $ 5,835 | $ 4,194
Impaired loans with a valuation allowance | 4,663 | 4,918 | 4,918 | 4,663
Total impaired loans | 8,857 | 10,753 | 10,753 | 8,857
Valuation allowance related to impaired loans | 1,996 | 2,436 | 2,436 | 1,996
Total non-accrual loans | 4,689 | 5,470 | 5,470 | 4,689
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0 | 0
Average investment in impaired loans | $ 9,660 | $ 10,662 | $ 11,059 | $ 10,710

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