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Mergers and Acquisitions - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Apr. 01, 2025
USD ($)
bankingLocation
shares
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Business Combination [Line Items]                    
Merger and conversion related expenses     $ 17,494 $ 20,479 $ 11,273 $ 20,479 $ 38,764 $ 11,273    
Goodwill resulting from merger $ 1,411,711   1,411,711   988,898   1,411,711 988,898 $ 988,898 $ 991,665
Goodwill, measurement period adjustment             422,813 0    
Weighted average useful life (in years) 9 years                  
Credit provision expense       $ 66,612            
The First                    
Business Combination [Line Items]                    
Transaction value   $ 1,052,690                
Shares issued to common shareholders (in shares) | shares   30,811,851                
Cash settlement for stock options   $ 1,869                
Voting interest acquired (percent)   100.00%                
Number of locations acquired | bankingLocation   116                
Merger and conversion related expenses     17,494   $ 4,746   $ 38,764 $ 4,746    
Intangible assets, including goodwill   $ 582,423                
Goodwill resulting from merger   272,520                
Core deposit intangible   159,610                
Goodwill, measurement period adjustment     $ 8,071              
Goodwill, Prior to measurement period adjustment   $ 430,884                
Weighted average useful life (in years)   10 years                
Long-term debt   $ 422,067                
The First | Subordinated notes                    
Business Combination [Line Items]                    
Long-term debt   95,262                
The First | Junior subordinated debentures                    
Business Combination [Line Items]                    
Long-term debt   25,653                
The First | Federal Home Loan Bank Advances                    
Business Combination [Line Items]                    
Short-term borrowings   298,250                
Fair Value of Net Assets Acquired at Date of Acquisition                    
Business Combination [Line Items]                    
Goodwill resulting from merger   422,813                
Long-term debt   $ 419,165