Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 84,319	$ 39,752
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	15,614	1,897
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	8,459	6,208
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	31,551	19,036
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	1,363
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	30,188	19,036
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	26,116	12,524
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 2,579	$ 87