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Loans and the Allowance for Credit Losses - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]      
Net deferred loan fee income (costs) $ (12,600,000)   $ (11,900,000)
Un-accreted discount on purchased loans from acquisitions 351,600,000   10,500,000
Provision for credit losses on loans and loan commitments 68,892,000 $ 4,021,000  
Reserve on accrued interest related to CARES Act 100,000    
Reserve on accrued interest related to individually-evaluated loans $ 200,000    
Percentage of national unemployment projection 4.40%    
Expected average percentage of national unemployment in future 5.00%    
Accrued interest receivable for loans $ 86,800,000   62,200,000
Accrued interest receivable for loans related to CARES Act 14,100,000   13,900,000
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard 42,300,000   23,300,000
Internally assigned loan grades to residential real estate, home equity and consumer loans 5,200,000   4,500,000
Unfunded commercial loan commitments 39,100,000   36,100,000
Modifications loans 49,300,000 26,083,000  
TDRs defaulted 3,516,000    
Other real estate owned 1,310,000   649,000
Net charge-offs 2,771,000 5,935,000  
Residential Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Provision for credit losses on loans and loan commitments 7,556,000 659,000  
Modifications loans 496,000 579,000  
Other real estate owned 700,000   0
Foreclosure proceedings in process on residential real estate loans 16,800,000   4,000,000
Net charge-offs 96,000 101,000  
90 Days or More Past Due [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Modification to allowance due to modified loan subsequently defaulting 0    
Premier Financial Corporation [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Provision for credit losses on loans and loan commitments 59,400,000    
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Provision for credit losses on loans and loan commitments 20,316,000 5,930,000  
Modifications loans 5,364,000 41,000  
Net charge-offs 583,000 $ 4,409,000  
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 $ 1,000,000   $ 500,000