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Acquisition and Divestiture Activity - Total Consideration (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
May 01, 2025
Apr. 01, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Assets                
Goodwill     $ 2,409,886 $ 2,170,709 $ 2,418,658 $ 2,176,999 $ 2,175,251 $ 1,998,716
Liabilities                
Securities sold under agreements to repurchase         277,594 244,626 $ 268,975  
Fair value of consideration                
Issuance of common stock (in shares)     1,033,262 417,598 $ 1,033,262 $ 417,598    
Common Stock                
Fair value of consideration                
Issuance of common stock (in shares)     $ 50,183 $ 24,014        
Bremer                
Assets                
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 11,110,449              
Premises and equipment 110,157              
Goodwill 243,407              
Other intangible assets 440,099              
Company-owned life insurance 181,909              
Other assets 794,184              
Total assets 16,270,947              
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 247,143              
Total liabilities 14,923,052              
Fair value of consideration                
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) $ 20.67              
CapStar Financial Holdings, Inc.                
Assets                
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            
Total assets   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                
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