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Fair Value - Narrative (Details) - Loans Held for Sale - Fair Value - Level 3 - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans related to Ginnie Mae guaranteed securitizations $ 26,409 $ 25,950 $ 0
Ginnie Mae Loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans related to Ginnie Mae guaranteed securitizations $ 26,409