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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, 2020
Dec. 31, 2019
Apr. 08, 2019
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 10 years    
Core Deposits Intangibles      
Finite-Lived Intangible Assets [Line Items]      
2020 $ 9.9    
2021 9.0    
2022 8.2    
2023 7.3    
2024 6.5    
Thereafter 10.3    
Total $ 51.2 $ 62.1 $ 3.0