Financial Instruments With Off-Balance Sheet Risk - Summary of Outstanding Contract Amounts of Off Balance Sheet Credit Risk Related Financial Instruments (Detail) - Unfunded Loan Commitment [Member] - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule Of Loans And Leases Receivable Unfunded Commitments Under Line Of Credit [Line Items]
Unfunded commitments under lines of credit	$ 571,840	$ 612,306
Home equity loans [Member]
Schedule Of Loans And Leases Receivable Unfunded Commitments Under Line Of Credit [Line Items]
Unfunded commitments under lines of credit	91,167	97,677
Commercial real estate, construction, and land development [Member]
Schedule Of Loans And Leases Receivable Unfunded Commitments Under Line Of Credit [Line Items]
Unfunded commitments under lines of credit	148,159	161,551
Commercial and industrial [Member]
Schedule Of Loans And Leases Receivable Unfunded Commitments Under Line Of Credit [Line Items]
Unfunded commitments under lines of credit	$ 332,514	$ 353,078