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Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Lower of Cost or Fair Value (Footnote) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Ginnie Mae [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale, at lower of cost or fair value $ 19.6 $ 24.8 $ 85.9