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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, 2017
Sep. 30, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance $ 679,256 $ 761,190
Sales and other transfers (2,672) (1,474)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] 2,172 (4,654)
Realization of expected future cash flows and other changes [1] (80,609) (58,954)
Ending balance 598,147 696,108
Fair Value Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 13,357 15,071
Sales and other transfers 0 (3)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] (131) (4,654)
Realization of expected future cash flows and other changes [1] (1,385) (1,399)
Ending balance 11,841 9,015
Fair Value Non-Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 665,899 746,119
Sales and other transfers (2,672) (1,471)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] 2,303 0
Realization of expected future cash flows and other changes [1] (79,224) (57,555)
Ending balance $ 586,306 $ 687,093
[1] Changes in fair value are recognized in Servicing and origination expense in the unaudited consolidated statements of operations.