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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 4,194	$ 1,228
Impaired loans with a valuation allowance	4,663	10,711
Total impaired loans	8,857	11,939
Valuation allowance related to impaired loans	1,996	2,184
Total nonaccrual loans	4,689	8,076
Total loans past-due ninety days or more and still accruing	0	0
Average investment in impaired loans	10,710	12,247	$ 10,232
Interest income recognized on impaired loans	361	292	269
Interest income recognized on a cash basis on impaired loans	$ 97	$ 188	$ 135

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Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

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