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Loans and the Allowance for Credit Losses - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]          
Net deferred loan fee income (costs) $ 13,700,000   $ 13,700,000   $ 11,900,000
Un-accreted discount on purchased loans from acquisitions 317,000,000   317,000,000   10,500,000
Reserve on accrued interest related to CARES Act 100,000   100,000    
Reserve on accrued interest related to individually-evaluated loans $ 100,000   $ 100,000    
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 $ 88,700,000   $ 88,700,000   62,200,000
Accrued interest receivable for loans related to CARES Act 13,600,000   13,600,000   13,900,000
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard 52,600,000   52,600,000   23,300,000
Internally assigned loan grades to residential real estate, home equity and consumer loans 12,900,000   12,900,000   4,500,000
Unfunded commercial loan commitments 26,700,000   26,700,000   36,100,000
Modifications loans 63,848,000 $ 23,995,000 113,695,000 $ 50,019,000  
Other real estate owned 618,000   618,000   649,000
Net charge-offs     15,967,000 9,577,000  
Residential Real Estate [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Modifications loans 1,939,000 1,273,000 4,390,000 1,990,000  
Other real estate owned 600,000   600,000    
Foreclosure proceedings in process on residential real estate loans 11,300,000   11,300,000   $ 4,000,000
Net charge-offs     513,000 86,000  
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 $ 445,000 $ 1,454,000 4,931,000 1,872,000  
Net charge-offs     4,399,000 5,259,000  
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     $ 3,700,000 $ 1,700,000