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Acquisition and Divestiture Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Oct. 26, 2023
USD ($)
$ / shares
Nov. 18, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]          
Assets     $ 49,059,448   $ 46,763,372
Total loans     32,577,834   31,123,641
Deposits     37,252,676   $ 35,000,830
Deposits, health savings accounts   $ 382,000      
Gain on sale of health savings accounts business   $ 90,700      
First Midwest          
Business Acquisition [Line Items]          
Transaction costs, expensed     23,200 $ 100,600  
CapStar Financial Holdings, Inc. | Subsequent Event          
Business Acquisition [Line Items]          
Shares exchange ratio 1.155        
Value of issuance common stock shares $ 344,400        
Share price (in dollars per share) | $ / shares $ 16.64        
Weighted average closing stock price 30 days        
CapStar Financial Holdings, Inc. | CapStar Financial Holdings, Inc.          
Business Acquisition [Line Items]          
Assets     3,300,000    
Total loans     2,300,000    
Deposits     $ 2,800,000