Loans - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 8,208	$ 9,253
Net deferred loan fees	2,542	1,652
Accrued interest receivable	11,489	11,178
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,587	859
Commercial and Agriculture [Member] | Paycheck Protection Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 399	$ 566