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Mergers and Acquisitions - Narrative (Details)
 3 Months Ended
Apr. 01, 2025
USD ($)
bankingLocation
shares
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Business Combination [Line Items]        
Merger and conversion related expenses   $ 0 $ 791,000  
Goodwill resulting from merger   1,406,667,000 $ 988,898,000 $ 1,405,840,000
Goodwill, measurement period adjustment   $ 827,000    
The First        
Business Combination [Line Items]        
Transaction value $ 1,052,690,000      
Shares issued to common shareholders (in shares) | shares 30,811,851      
Cash settlement for stock options $ 1,869,000      
Voting interest acquired (percent) 100.00%      
Number of locations acquired | bankingLocation 116      
Intangible assets, including goodwill $ 584,499,000      
Goodwill resulting from merger 418,196,000      
Core deposit intangible 165,476,000      
Customer relationship intangible 5,866,000      
Goodwill, measurement period adjustment 827,000      
Goodwill, Prior to measurement period adjustment $ 418,196,000      
Weighted average useful life (in years) 10 years      
Long-term debt $ 419,165,000      
The First | Subordinated notes        
Business Combination [Line Items]        
Long-term debt 95,262,000      
The First | Junior subordinated debentures        
Business Combination [Line Items]        
Long-term debt 25,653,000      
The First | Federal Home Loan Bank Advances        
Business Combination [Line Items]        
Short-term borrowings 298,250,000      
Fair Value of Net Assets Acquired        
Business Combination [Line Items]        
Goodwill resulting from merger 419,023,000      
Long-term debt $ 419,165,000