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Goodwill and Core Deposit Intangibles - Schedule of Future Estimated CDI Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
2023 $ 14.6  
2024 13.7  
2025 12.8  
2026 10.1  
2027 7.6  
Thereafter 22.6  
Finite-Lived Intangible Assets, Net 81.4 $ 97.0
Core Deposits Intangibles    
Finite-Lived Intangible Assets [Line Items]    
2023 12.7  
2024 11.8  
2025 10.9  
2026 8.2  
2027 5.7  
Thereafter 12.9  
Finite-Lived Intangible Assets, Net 62.2 75.9
OCRI    
Finite-Lived Intangible Assets [Line Items]    
2023 1.9  
2024 1.9  
2025 1.9  
2026 1.9  
2027 1.9  
Thereafter 9.7  
Finite-Lived Intangible Assets, Net $ 19.2 $ 21.1