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Fair Value - Schedule of Reconciliation of Changes in Fair Value of Level 3 Assets and Liabilities (Footnote) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Loans Held for Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Change in fair value adjustments on loans held for investment $ 2.7 $ 5.6