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Goodwill and Core Deposit Intangibles - Schedule of Future Estimated CDI Amortization Expense (Details) - Core Deposits Intangibles - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
2018 $ 8.9  
2019 8.1  
2020 7.5  
2021 6.9  
2022 6.3  
Thereafter 19.2  
Total $ 56.9 $ 49.1