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Merger, Acquisition, and Divestiture Activity - Additional Information (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 25, 2024
USD ($)
$ / shares
shares
Apr. 01, 2024
USD ($)
Nov. 18, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 15, 2022
USD ($)
Business Acquisition [Line Items]              
Purchase price of loans at acquisition   $ 610,700   $ 610,691      
Par value of acquired loans at acquisition   679,300   679,302      
Allowance for credit losses at acquisition   26,700   26,725      
Plan assets       0 $ 0    
Deposits, health savings accounts     $ 382,000        
Gain on sale of health savings accounts     $ 90,700 0 0 $ 90,673  
Property optimization       0 1,559 26,818  
Assets       53,552,272 49,089,836    
Total loans       36,285,887 32,991,927    
Deposits       40,823,560 37,235,180    
Bremer              
Business Acquisition [Line Items]              
Assets       16,500,000      
Total loans       11,800,000      
Deposits       13,200,000      
CapStar Financial Holdings, Inc.              
Business Acquisition [Line Items]              
Other intangible assets   46,125          
Allowance for credit losses at acquisition   $ 26,700          
Acquisition and integration related costs       26,300      
CapStar Financial Holdings, Inc. | Core deposit              
Business Acquisition [Line Items]              
Estimated useful lives of core deposits and customer relationships   10 years          
First Midwest              
Business Acquisition [Line Items]              
Other intangible assets             $ 117,584
Transaction costs, expensed       8,500 $ 28,700 $ 120,900  
Bremer              
Business Acquisition [Line Items]              
Shares exchange ratio 4.182            
Cash per share above exchange (in dollars per share) | $ / shares $ 26.22            
Value of issuance common stock shares $ 1,400,000            
Price per share (in dollars per share) | $ / shares $ 116.76            
Transaction costs       $ 2,500      
Bremer | Citibank, N.A              
Business Acquisition [Line Items]              
Forward Contract Indexed to Issuer's Equity, Shares | shares 19,047,619            
Forward Contract Indexed to Equity, Settlement, Cash, Amount $ 400,000            
Bremer | Citigroup Global Markets Inc.              
Business Acquisition [Line Items]              
Business Acquisition, Equity Interest Issued or Issuable, Period For Additional Purchases 30 days            
Business Acquisition, Equity Interest Issued or Issuable, Additional Number of Shares To Purchase | shares 2,857,143            
Business Acquisition, Equity Interest Issued or Issuable, Additional Number of Shares | shares 2,857,143