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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 761,190 $ 93,901  
Fair value election - transfer from MSRs carried at amortized cost 0 787,142  
Cumulative effect of fair value election 0 52,015  
Sales (148) (72,274)  
Additions recognized on the sale of residential mortgage loans 0 1,007  
Servicing transfers and adjustments (1,548) (2,428)  
Changes in valuation inputs or other assumptions [1] 305 10,045  
Realization of expected future cash flows and other changes [1] (80,543) (108,218)  
Ending balance 679,256 761,190 $ 93,901
Fair Value Agency Mortgage Servicing Rights [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 15,071 93,901 116,029
Fair value election - transfer from MSRs carried at amortized cost 0 0 0
Cumulative effect of fair value election 0 0 0
Sales (3) (70,930) 0
Additions recognized on the sale of residential mortgage loans 0 0 0
Servicing transfers and adjustments 0 0 0
Changes in valuation inputs or other assumptions [1] 305 (639) (15,028)
Realization of expected future cash flows and other changes [1] (2,016) (7,261) (7,100)
Ending balance 13,357 15,071 93,901
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 from MSRs carried at amortized cost 0 787,142  
Cumulative effect of fair value election 0 52,015  
Sales (145) (1,344)  
Additions recognized on the sale of residential mortgage loans 0 1,007  
Servicing transfers and adjustments (1,548) (2,428)  
Changes in valuation inputs or other assumptions [1] 0 10,684  
Realization of expected future cash flows and other changes [1] (78,527) (100,957)  
Ending balance $ 665,899 $ 746,119 $ 0
[1] Changes in fair value are recognized in Servicing and origination expense in the consolidated statements of operations.