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Loans Held for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Transfers and Servicing [Abstract]              
Loans held for sale $ 0       $ 0   $ 2,885,640
Loan transfer to held-for-sale             $ 206,000
Proceeds from sale of loans receivable   $ 27,000 $ 3,160,000        
Net proceeds from sales of loans held for investment, principal   25,000 2,970,000   2,990,000    
Net proceeds from sales of loans held for investment, capitalized interest   $ 2,000 $ 193,000   195,000    
Gain from sale $ (10)     $ (4) $ 402,780 $ 238,562