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Mortgage Servicing - Schedule of Estimated Change in Fair Value of MSRs (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Transfers and Servicing [Abstract]  
Weighted average prepayment speeds, 10% $ (92,659)
Weighted average prepayment speeds, 20% (178,462)
Discount rate (Option-adjusted spread), 10% (28,326)
Discount rate (Option-adjusted spread), 20% $ (54,351)