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	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Loans And Leases Receivable Unfunded Commitments Under Line Of Credit [Line Items]
Unfunded commitments under lines of credit	$ 577,917	$ 609,954
Home equity loans [Member]
Schedule Of Loans And Leases Receivable Unfunded Commitments Under Line Of Credit [Line Items]
Unfunded commitments under lines of credit	111,588	116,964
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	137,570	186,966
Commercial and industrial [Member]
Schedule Of Loans And Leases Receivable Unfunded Commitments Under Line Of Credit [Line Items]
Unfunded commitments under lines of credit	$ 328,759	$ 306,024