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Acquisition and Divestiture Activity - Total Consideration (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended
Apr. 01, 2024
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]                
Goodwill   $ 2,170,709,000 $ 2,170,709,000 $ 1,998,716,000 $ 1,998,716,000 $ 1,998,716,000 $ 1,998,716,000 $ 1,998,716,000
Business Combination, Consideration Transferred [Abstract]                
Issuance of common stock   417,598,000 $ 417,598,000 $ 0        
Common Stock                
Business Combination, Consideration Transferred [Abstract]                
Issuance of common stock $ 24,014,000 $ 24,014,000            
Share price (in dollars per share) $ 17.41              
CapStar Financial Holdings, Inc.                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]                
Cash and cash equivalents $ 177,791,000              
Investment securities 342,490,000              
FHLB/Federal Reserve Bank stock 14,426,000              
Loans held-for-sale 21,159,000              
Loans, net of allowance for credit losses 2,124,695,000              
Premises and equipment 22,481,000              
Goodwill 171,993,000              
Other intangible assets 46,125,000              
Company-owned life insurance 91,475,000              
Other assets 95,530,000              
Total assets 3,108,165,000              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]                
Deposits 2,560,464,000              
Federal Home Loan Bank advances 75,000,000              
Other borrowings 30,000,000              
Accrued expenses and other liabilities 25,103,000              
Total liabilities 2,690,567,000              
Business Combination, Consideration Transferred [Abstract]                
Total consideration $ 417,598,000              
CapStar Financial Holdings, Inc. | Common Stock                
Business Combination, Consideration Transferred [Abstract]                
Issuance of common stock shares for acquisitions of business (in shares) 417,598