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Goodwill and Core Deposit Intangibles - Schedule of Future Estimated CDI Amortization Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Core Deposits Intangibles    
Finite-Lived Intangible Assets [Line Items]    
2020 $ 9.0  
2021 8.2  
2022 7.3  
2023 6.5  
2024 5.9  
Thereafter 4.4  
Total $ 41.3 $ 51.2