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Loans Held for Sale - Schedule of Loans Held for Sale Fair Value (Footnote) (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Increase (decrease) in fair value of loans held for sale $ (5,800,000) $ (7,400,000)    
Loans held for sale, at fair value 366,966,000 207,645,000 $ 208,752,000 $ 176,525,000
Ginnie Mae Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans held for sale, at fair value $ 26,400,000 $ 0