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Goodwill and Core Deposit Intangibles - Schedule of Future Estimated CDI Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
2023 $ 15.6  
2024 14.6  
2025 13.7  
2026 12.8  
2027 10.1  
Thereafter 30.2  
Finite-Lived Intangible Assets, Net 97.0 $ 41.3
Core Deposits Intangibles    
Finite-Lived Intangible Assets [Line Items]    
2023 13.7  
2024 12.7  
2025 11.8  
2026 10.9  
2027 8.2  
Thereafter 18.6  
Finite-Lived Intangible Assets, Net 75.9 41.3
OCRI    
Finite-Lived Intangible Assets [Line Items]    
2023 1.9  
2024 1.9  
2025 1.9  
2026 1.9  
2027 1.9  
Thereafter 11.6  
Finite-Lived Intangible Assets, Net $ 21.1 $ 0.0