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Loans - Schedule of Outstanding Unpaid Balances and Accrual Status of Loans Acquired with Credit Impairment (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]    
Outstanding balance $ 40.9 $ 43.4
Total carrying value 28.0 30.2
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Value, Accrual Status $ 28.0 $ 30.2