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Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]      
Additions $ 35,494 $ 10,829 $ 3,657
Servicing asset:      
Balance at beginning of period 40,972 35,789 37,267
Additions 35,494 10,829 3,657
Amortization (7,908) (5,646) (5,135)
Balance before valuation allowance at end of period 68,558 40,972 35,789
Valuation allowance:      
Balance at beginning of period (36) 0 0
(Additions)/recoveries (108) (36) 0
Balance at end of period (144) (36) 0
Loan servicing rights, net 68,414 40,936 $ 35,789
Bremer      
Servicing Assets at Fair Value [Line Items]      
Additions 22,700    
Servicing asset:      
Additions $ 22,700    
CapStar Financial Holdings, Inc.      
Servicing Assets at Fair Value [Line Items]      
Additions   2,700  
Servicing asset:      
Additions   $ 2,700