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Goodwill and Core Deposit Intangibles - Schedule of Future Amortization Expense (Details) - Core Deposits - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
2019 remaining $ 5.9  
2020 10.8  
2021 9.9  
2022 9.0  
2023 8.2  
Thereafter 24.1  
Total $ 67.9 $ 56.9