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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