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Mortgage Servicing - Schedule of Estimated Change in Fair Value of MSRs (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
Transfers and Servicing [Abstract]  
Weighted average prepayment speeds, 10% $ (77,665)
Weighted average prepayment speeds, 20% (150,075)
Discount rate (Option-adjusted spread), 10% (17,894)
Discount rate (Option-adjusted spread), 20% $ (34,728)