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Fair Value - Schedule of Estimated Change in Fair Value of MSRs (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Transfers and Servicing [Abstract]  
Weighted average prepayment speeds, 10% $ (55,715)
Weighted average prepayment speeds, 20% (106,603)
Weighted average discount rate, 10% (15,696)
Weighted average discount rate, 20% $ (30,468)