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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance $ 679,256 $ 761,190
Sales (228) (142)
Servicing transfers and adjustments (706) 419
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] 494 (6,380)
Realization of expected future cash flows and other changes [1] (26,829) (22,913)
Ending balance 651,987 732,174
Fair Value Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 13,357 15,071
Sales 0 0
Servicing transfers and adjustments 0 0
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] 494 (2,709)
Realization of expected future cash flows and other changes [1] (445) (351)
Ending balance 13,406 12,011
Fair Value Non-Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 665,899 746,119
Sales (228) (142)
Servicing transfers and adjustments (706) 419
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] 0 (3,671)
Realization of expected future cash flows and other changes [1] (26,384) (22,562)
Ending balance $ 638,581 $ 720,163
[1] Changes in fair value are recognized in Servicing and origination expense in the unaudited consolidated statements of operations.