Commitments and Credit Risk - Summary of Contractual Amounts of Commitments and Standby Letters of Credit to Originate Loans and Available Lines of Credit (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Standby Letters of Credit [Member]
Commitments And Contingencies [Line Items]
Loans commitments, Fixed Rate	$ 15,081	$ 18,145
Loans commitments, Variable Rate	27,715	30,680
Commitments to Make Loans [Member]
Commitments And Contingencies [Line Items]
Loans commitments, Fixed Rate	28,758	47,465
Loans commitments, Variable Rate	389,370	343,715
Mortgage Loans in the Process of Origination [Member]
Commitments And Contingencies [Line Items]
Loans commitments, Fixed Rate	1,345	4,574
Loans commitments, Variable Rate	2,252	357
Unused Lines of Credit [Member]
Commitments And Contingencies [Line Items]
Loans commitments, Fixed Rate	162,753	124,893
Loans commitments, Variable Rate	$ 377,091	$ 355,270