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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 679,256 $ 761,190 $ 93,901
Fair value election - transfer from MSRs carried at amortized cost 0 0 787,142
Cumulative effect of fair value election 0 0 52,015
Sales (540) (148) (72,274)
Additions recognized on the sale of residential mortgage loans 162 0 1,007
Servicing transfers and adjustments (2,376) (1,548) (2,428)
Changes in valuation inputs or other assumptions [1] 86,964 305 10,045
Realization of expected future cash flows and other changes [1] (91,504) (80,543) (108,218)
Ending balance 671,962 679,256 761,190
Fair Value Agency Mortgage Servicing Rights [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 13,357 15,071 93,901
Fair value election - transfer from MSRs carried at amortized cost 0 0 0
Cumulative effect of fair value election 0 0 0
Sales 0 (3) (70,930)
Additions recognized on the sale of residential mortgage loans 162 0 0
Servicing transfers and adjustments 0 0 0
Changes in valuation inputs or other assumptions [1] 243 305 (639)
Realization of expected future cash flows and other changes [1] (1,802) (2,016) (7,261)
Ending balance 11,960 13,357 15,071
Fair Value Non-Agency Mortgage Servicing Rights [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 665,899 746,119 0
Fair value election - transfer from MSRs carried at amortized cost 0 0 787,142
Cumulative effect of fair value election 0 0 52,015
Sales (540) (145) (1,344)
Additions recognized on the sale of residential mortgage loans 0 0 1,007
Servicing transfers and adjustments (2,376) (1,548) (2,428)
Changes in valuation inputs or other assumptions [1] 86,721 0 10,684
Realization of expected future cash flows and other changes [1] (89,702) (78,527) (100,957)
Ending balance $ 660,002 $ 665,899 $ 746,119
[1] Changes in fair value are recognized in Servicing and origination expense in the consolidated statements of operations.