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Loans and the Allowance for Credit Losses - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Financing Receivable, Recorded Investment [Line Items]
Net deferred loan fee income (costs)	$ 14,000,000		$ 14,000,000		$ 13,900,000
Un-accreted discount on purchased loans from acquisitions	$ 261,200,000		$ 261,200,000		302,400,000
Percentage of national unemployment projection	4.70%		4.70%
Expected average percentage of national unemployment in future	5.30%		5.30%
Accrued interest receivable for loans	$ 85,500,000		$ 85,500,000		87,800,000
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard	68,600,000		68,600,000		61,400,000
Internally assigned loan grades to residential real estate, home equity and consumer loans	14,100,000		14,100,000		16,500,000
Unfunded commercial loan commitments	32,500,000		32,500,000		57,100,000
Modifications loans	54,153,000	$ 63,848,000	83,013,000	$ 113,695,000
Other real estate owned	1,593,000		1,593,000		618,000
Net charge-offs			18,856,000	15,967,000
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Modifications loans	78,000	1,939,000	276,000	4,390,000
Other real estate owned	1,200,000		1,200,000		600,000
Foreclosure proceedings in process on residential real estate loans	18,000,000		18,000,000		$ 11,400,000
Net charge-offs			1,714,000	513,000
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Modification to allowance due to modified loan subsequently defaulting	0		0
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Modifications loans	$ 22,471,000	$ 445,000	28,813,000	4,931,000
Net charge-offs			11,889,000	4,399,000
Commercial and Industrial [Member] \| Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Annual sales of borrowers			100,000,000
Unfunded Loan Commitment [Member]
Financing Receivable, Recorded Investment [Line Items]
Modifications loans			$ 5,000	$ 1,700