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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 93,901    
Ending balance 761,190 $ 93,901  
Conventional [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 93,901    
Fair value election - transfer of MSRs carried at amortized cost 787,142    
Cumulative effect of fair value election 52,015    
Sales (72,274)    
Additions recognized on the sale of residential mortgage loans 1,007    
Servicing transfers and adjustments (2,428)    
Changes in valuation inputs or other assumptions [1] 10,045    
Realization of expected future cash flows and other changes [1] (108,218)    
Ending balance 761,190 93,901  
Fair Value Agency Mortgage Servicing Rights [Member] | Conventional [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 93,901 116,029 $ 85,213
Fair value election - transfer of MSRs carried at amortized cost 0 0 0
Cumulative effect of fair value election 0 0 0
Sales (70,930) 0 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] (639) (15,028) 44,199
Realization of expected future cash flows and other changes [1] (7,261) (7,100) (13,383)
Ending balance 15,071 93,901 $ 116,029
Fair Value Non-Agency Mortgage Servicing Rights [Member] | Conventional [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 0    
Fair value election - transfer of MSRs carried at amortized cost 787,142    
Cumulative effect of fair value election 52,015    
Sales (1,344)    
Additions recognized on the sale of residential mortgage loans 1,007    
Servicing transfers and adjustments (2,428)    
Changes in valuation inputs or other assumptions [1] 10,684    
Realization of expected future cash flows and other changes [1] (100,957)    
Ending balance $ 746,119 $ 0  
[1] Changes in fair value are recognized in Servicing and origination expense in the Consolidated Statements of Operations.