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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,228	$ 5,172
Impaired loans with a valuation allowance	10,711	9,360
Total impaired loans	11,939	14,532
Valuation allowance related to impaired loans	2,184	1,657
Total nonaccrual loans	8,076	9,404
Total loans past-due ninety days or more and still accruing	0	0
Average investment in impaired loans	12,247	10,232	$ 2,649
Interest income recognized on impaired loans	292	269	118
Interest income recognized on a cash basis on impaired loans	$ 188	$ 135	$ 9

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