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Fair Value - Schedule of Reconciliation of Changes in Fair Value of Level 3 Assets and Liabilities (Footnote) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
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 $ 2.9