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Goodwill and Intangibles - Schedule of Future Amortization Expense (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Total $ 54.6 $ 47.3
Core Deposits    
Finite-Lived Intangible Assets [Line Items]    
2019 remaining 6.6  
2018 8.1  
2019 7.5  
2020 6.9  
2021 6.3  
Thereafter 19.2  
Total $ 54.6