Loans - Recorded Investment for Consumer Loans, Credit Quality based on Status of Loan and Payment Activity (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans after net deferred loan fees and costs	$ 2,578,472	$ 2,356,387
Performing		659
Consumer - Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Performing		89,894
Consumer - Other [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Performing		89,853
Consumer - Other [Member] | Nonperforming [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Performing		41
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans after net deferred loan fees and costs	$ 521,908	494,423
Performing		405
Pass [Member] | Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans after net deferred loan fees and costs		492,575
Special Mention [Member] | Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans after net deferred loan fees and costs		676
Substandard [Member] | Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans after net deferred loan fees and costs		$ 1,172