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Fair Value - Schedule of Estimated Change in Fair Value of MSRs (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Transfers and Servicing [Abstract]  
Weighted average prepayment speeds, 10% $ (123,564)
Weighted average prepayment speeds, 20% (235,153)
Weighted average discount rate, 10% (47,473)
Weighted average discount rate, 20% $ (92,074)