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Goodwill and Core Deposit Intangibles - Schedule of Future Amortization Expense (Details) - Core Deposits - USD ($)
$ in Millions
Sep. 30, 2019
Apr. 08, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
2019 remaining $ 2.9    
2020 10.9    
2021 9.9    
2022 9.0    
2023 8.2    
Thereafter 24.1    
Total $ 65.0 $ 3.0 $ 56.9