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Mortgage Servicing - Summary of Estimated Change in the Value of MSRs Carried at Fair Value (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Transfers and Servicing [Abstract]  
Weighted average prepayment speeds, 10% $ (65,518)
Weighted average prepayment speeds, 20% (140,457)
Discount rate (Option-adjusted spread), 10% (17,407)
Discount rate (Option-adjusted spread), 20% $ (34,492)