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Merger, Acquisition, and Divestiture Activity - Total Consideration (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
May 01, 2025
Apr. 01, 2024
May 31, 2025
Apr. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Business Combination, Recognized Asset Acquired, Asset [Abstract]                
Goodwill         $ 2,425,700 $ 2,175,251 $ 1,998,716 $ 1,998,716
Liabilities                
Securities sold under agreements to repurchase         261,366 268,975    
Fair value of consideration                
Issuance of common stock (in shares)         1,033,262 417,598    
Common Stock                
Fair value of consideration                
Issuance of common stock (in shares)         50,183 $ 24,014    
Bremer                
Business Combination, Recognized Asset Acquired, Asset [Abstract]                
Cash and cash equivalents $ 449,757              
Equity securities 26,070              
Investment securities 2,811,108              
FHLB/Federal Reserve Bank stock 93,924              
Loans held-for-sale 9,883              
Loans, net of allowance for credit losses 11,110,423              
Premises and equipment 99,965       $ 100,000      
Goodwill 250,449              
Other intangible assets 440,099              
Company-owned life insurance 181,909              
Other assets 797,460              
Business Combination, Recognized Asset Acquired, Asset, Total 16,271,047              
Liabilities                
Deposits 12,862,357              
Securities sold under agreements to repurchase 49,131              
Federal Home Loan Bank advances 1,559,227              
Other borrowings 205,194              
Accrued expenses and other liabilities 247,243              
Total liabilities 14,923,152              
Fair value of consideration                
Issuance of common stock (in shares)     $ 1,000,000          
Cash 314,633              
Total consideration 1,347,895              
Bremer | Common Stock                
Fair value of consideration                
Issuance of common stock (in shares) $ 1,033,262              
Issuance of common stock shares for acquisitions of business (in shares) 50,183,000              
Share price (in dollars per share) $ 20.59              
CapStar Financial Holdings, Inc.                
Business Combination, Recognized Asset Acquired, Asset [Abstract]                
Cash and cash equivalents   $ 177,791            
Investment securities   342,490            
FHLB/Federal Reserve Bank stock   14,426            
Loans held-for-sale   21,159            
Loans, net of allowance for credit losses   2,120,627            
Premises and equipment   22,481            
Goodwill   176,535            
Other intangible assets   46,125            
Company-owned life insurance   91,475            
Other assets   95,922            
Business Combination, Recognized Asset Acquired, Asset, Total   3,109,031            
Liabilities                
Deposits   2,560,124            
Federal Home Loan Bank advances   75,000            
Other borrowings   30,000            
Accrued expenses and other liabilities   26,309            
Total liabilities   2,691,433            
Fair value of consideration                
Issuance of common stock (in shares)       $ 417,600        
Total consideration   417,598            
CapStar Financial Holdings, Inc. | Common Stock                
Fair value of consideration                
Issuance of common stock (in shares)   $ 417,598            
Issuance of common stock shares for acquisitions of business (in shares)   24,014,000            
Share price (in dollars per share)   $ 17.41