XML 55 R44.htm IDEA: XBRL DOCUMENT v3.25.3
Acquisition and Divestiture Activity - Additional Information (Details)
 3 Months Ended 9 Months Ended
May 23, 2025
USD ($)
shares
May 01, 2025
USD ($)
$ / shares
Nov. 25, 2024
USD ($)
shares
Apr. 01, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
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   1,876,520,000            
Par value of acquired loans at acquisition   2,055,948,000            
Allowance for credit losses at acquisition   103,546,000     $ 103,500,000      
Transaction costs, expensed         67,000,000.0   $ 108,000,000.0  
Payments for merger related costs         67,000,000.0   108,000,000.0  
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  
Adjustment, freezing of benefits             21,000,000.0  
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         $ 2,200,000 $ 6,900,000 $ 3,600,000 $ 29,200,000
CapStar Financial Holdings, Inc. | Core deposit                
Business Combination [Line Items]                
Estimated useful lives       10 years