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Allowance for Credit Losses on Loans - Schedule of Loans and Reserve Balances by Loan Segment Both Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve		$ 173
Individually Evaluated, Loans		3,072
Collectively Evaluated, Reserve		2,117
Collectively Evaluated, Loans		494,817
Total Reserve	$ 5,561	2,290	$ 4,026	$ 4,402
Total Loans	$ 592,071	497,889
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve		40
Individually Evaluated, Loans		704
Collectively Evaluated, Reserve		1,336
Collectively Evaluated, Loans		313,181
Total Reserve		1,376	2,429	2,753
Total Loans		313,885
Non-Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve		133
Individually Evaluated, Loans		2,368
Collectively Evaluated, Reserve		781
Collectively Evaluated, Loans		181,636
Total Reserve		914	$ 1,597	$ 1,649
Total Loans		$ 184,004