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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance $ 761,190 $ 93,901
Fair value election - transfer of MSRs carried at amortized cost 0 787,142
Cumulative effect of fair value election 0 52,015
Sales (143) (68,989)
Servicing transfers and adjustments (1,275) (1,139)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] (5,033) (580)
Realization of expected future cash flows and other changes [1] (54,071) (47,900)
Ending balance 700,668 814,450
Fair Value Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 15,071 93,901
Fair value election - transfer of MSRs carried at amortized cost 0 0
Cumulative effect of fair value election 0 0
Sales 0 (68,144)
Servicing transfers and adjustments 0 0
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] (5,033) (580)
Realization of expected future cash flows and other changes [1] (855) (6,256)
Ending balance 9,183 18,921
Fair Value Non-Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 746,119 0
Fair value election - transfer of MSRs carried at amortized cost 0 787,142
Cumulative effect of fair value election 0 52,015
Sales (143) (845)
Servicing transfers and adjustments (1,275) (1,139)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] 0 0
Realization of expected future cash flows and other changes [1] (53,216) (41,644)
Ending balance $ 691,485 $ 795,529
[1] Changes in fair value are recognized in Servicing and origination expense in the Unaudited Consolidated Statements of Operations.