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Acquisition and Divestiture Activity - Additional Information (Details)
 3 Months Ended 6 Months Ended
May 01, 2025
USD ($)
$ / shares
shares
Nov. 25, 2024
USD ($)
shares
Apr. 01, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Business Combination [Line Items]              
Purchase price of loans at acquisition     $ 610,700,000        
Par value of acquired loans at acquisition     679,300,000        
Allowance for credit losses at acquisition     26,700,000        
Bremer              
Business Combination [Line Items]              
Cash per share above exchange (in dollars per share) | $ / shares $ 26.22            
Shares exchange ratio 4.182            
Expected tax deductible amount $ 0            
Other intangible assets 440,099,000            
Purchase price of loans at acquisition 1,900,000,000   1,889,330,000        
Par value of acquired loans at acquisition 2,100,000,000   2,055,589,000        
Allowance for credit losses at acquisition 90,400,000   90,442,000 $ 90,400,000      
Transaction costs, expensed       40,200,000   $ 40,900,000  
Payments for merger related costs       40,200,000   40,900,000  
Provision (release) for credit losses on unfunded loan commitments       6,500,000      
Allowance for credit loss, loan purchased       69,100,000      
Adjustment, freezing of benefits       21,000,000.0     $ 21,000,000.0
Business combination, provisional information, initial accounting incomplete, adjustment, financial liabilities           6,500,000  
Business combination, provisional information, initial accounting incomplete, adjustment, financial assets           69,100,000  
Bremer | Core deposit              
Business Combination [Line Items]              
Other intangible assets $ 397,100,000            
Estimated useful lives 10 years            
Bremer | Customer relationship              
Business Combination [Line Items]              
Other intangible assets $ 43,000,000.0            
Estimated useful lives 12 years            
Bremer | Citibank, N.A              
Business Combination [Line Items]              
Forward contract indexed to issuer's equity (in shares) | shares   19,047,619          
Forward contract indexed to equity, settlement, cash   $ 400,000,000          
Bremer | Citigroup Global Markets Inc.              
Business Combination [Line Items]              
Forward contract indexed to issuer's equity (in shares) | shares 21,904,762            
Forward contract indexed to equity, settlement, cash $ 443,200,000            
Additional number of shares to purchase (in shares) | shares   2,857,143          
Additional number of shares (in shares) | shares   2,857,143          
CapStar Financial Holdings, Inc.              
Business Combination [Line Items]              
Other intangible assets     46,125,000        
Purchase price of loans at acquisition     610,691,000        
Par value of acquired loans at acquisition     679,302,000        
Allowance for credit losses at acquisition     $ 26,725,000        
Transaction costs, expensed       $ 1,000,000 $ 19,400,000 $ 1,300,000 $ 22,300,000
CapStar Financial Holdings, Inc. | Core deposit              
Business Combination [Line Items]              
Estimated useful lives     10 years