Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 39,752	$ 26,808
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	1,897	1,841
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	6,208	4,777
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	19,036	9,557
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	19,036	9,557
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	12,524	10,582
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 87	$ 51