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Borrowings - Schedule of Aggregate Long-term Borrowings (Footnote) (Details) - Financing Liabilities [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt, gross $ 6,508,061 $ 5,195,074
Sale of MSRs and Rights To MSRs [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross 1,000,000  
HMBS - Related Borrowings [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 5,400,000