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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 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 (148) (71,318)
Servicing transfers and adjustments (1,326) (1,139)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] (4,654) 9,439
Realization of expected future cash flows and other changes [1] (58,954) (82,696)
Ending balance 696,108 787,344
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 (3) (70,084)
Servicing transfers and adjustments 0 0
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] (4,654) (2,592)
Realization of expected future cash flows and other changes [1] (1,399) (6,808)
Ending balance 9,015 14,417
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 (145) (1,234)
Servicing transfers and adjustments (1,326) (1,139)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] 0 12,031
Realization of expected future cash flows and other changes [1] (57,555) (75,888)
Ending balance $ 687,093 $ 772,927
[1] Changes in fair value are recognized in Servicing and origination expense in the Unaudited Consolidated Statements of Operations.