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Mortgage Servicing - Schedule of Estimated Change in Fair Value of MSRs (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Transfers and Servicing [Abstract]  
Weighted average prepayment speeds, 10% $ (66,764)
Weighted average prepayment speeds, 20% (135,780)
Discount rate (Option-adjusted spread), 10% (18,758)
Discount rate (Option-adjusted spread), 20% $ (34,142)