Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 35,468	$ 26,808
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	2,058	1,841
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	5,401	4,777
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	16,940	9,557
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	184
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	16,756	9,557
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	11,005	10,582
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 64	$ 51