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Borrowings - Schedule of Aggregate Long-term Borrowings (Footnote) (Details) - Financing Liabilities - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, gross $ 7,349,433 $ 7,036,030
Sale of MSRs and Rights To MSRs    
Debt Instrument [Line Items]    
Long-term debt, gross 567,000  
HMBS - Related Borrowings    
Debt Instrument [Line Items]    
Long-term debt, gross $ 6,800,000