Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2021
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 3,990	$ 1,228	$ 6,604	$ 1,228
Impaired loans with a valuation allowance	8,634	10,711	5,532	10,711
Total impaired loans	12,624	11,939	12,136	11,939
Valuation allowance related to impaired loans	1,535	2,184	1,109	2,184
Total non-accrual loans	8,581	8,076	8,139	8,076
Total loans past-due ninety days or more and still accruing	0	0	0	0
Average investment in impaired loans	$ 12,764	$ 11,676	$ 13,467	$ 12,247