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Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]      
Additions $ 10,829 $ 3,657 $ 13,080
Servicing asset:      
Balance at beginning of period 35,789 37,267 30,085
Additions 10,829 3,657 13,080
Amortization (5,646) (5,135) (5,898)
Balance before valuation allowance at end of period 40,972 35,789 37,267
Valuation allowance:      
Balance at beginning of period 0 0 (46)
(Additions)/recoveries (36) 0 46
Balance at end of period (36) 0 0
Loan servicing rights, net 40,936 $ 35,789 37,267
CapStar Financial Holdings, Inc.      
Servicing Assets at Fair Value [Line Items]      
Additions 2,700    
Servicing asset:      
Additions $ 2,700    
First Midwest      
Servicing Assets at Fair Value [Line Items]      
Additions     7,700
Servicing asset:      
Additions     $ 7,700