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