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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Receivables [Abstract]            
Impaired loans without a valuation allowance $ 5,680 $ 1,228 $ 3,063 $ 5,680 $ 3,063 $ 1,228
Impaired loans with a valuation allowance 4,989 10,711 8,976 4,989 8,976 10,711
Total impaired loans 10,669 11,939 12,039 10,669 12,039 11,939
Valuation allowance related to impaired loans 2,419 2,184 1,156 2,419 1,156 2,184
Total non-accrual loans 5,247 8,076 7,031 5,247 7,031 8,076
Total loans past-due ninety days or more and still accruing 0 0 0 0 0 0
Average investment in impaired loans $ 9,748 $ 11,676 $ 12,206 $ 11,258 $ 12,836 $ 12,247