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Acquisition and Divestiture Activity - Pending Acquisition (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Nov. 25, 2024
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Business Acquisition [Line Items]      
Assets   $ 53,877,944 $ 53,552,272
Total loans, net of unearned income   36,413,944 36,285,887
Deposits   41,034,572 40,823,560
Bremer      
Business Acquisition [Line Items]      
Cash per share above exchange (in dollars per share) | $ / shares $ 26.22    
Shares exchange ratio 4.182    
Value of issuance common stock shares $ 1,400,000    
Price per share (in dollars per share) | $ / shares $ 116.76    
Transaction costs   $ 700  
Bremer | Citibank, N.A      
Business Acquisition [Line Items]      
Forward contract indexed to issuer's equity (in shares) | shares 19,047,619    
Forward contract indexed to equity, settlement, cash $ 400,000    
Bremer | Citigroup Global Markets Inc.      
Business Acquisition [Line Items]      
Period for additional purchases 30 days    
Additional number of shares to purchase (in shares) | shares 2,857,143    
Additional number of shares (in shares) | shares 2,857,143    
Bremer      
Business Acquisition [Line Items]      
Assets     16,500,000
Total loans, net of unearned income     11,800,000
Deposits     $ 13,200,000