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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 93,901    
Sales   $ 0  
Changes in fair value:      
Ending balance 814,450   $ 93,901
Conventional [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 93,901    
Fair value election - transfer from MSRs carried at amortized cost 787,142    
Cumulative effect of fair value election 52,015    
Sales (68,989)    
Servicing transfers and adjustments (1,139)    
Changes in fair value:      
Changes in valuation inputs or other assumptions [1] (580)    
Realization of expected future cash flows and other changes [1] (47,900)    
Ending balance 814,450   93,901
Fair Value Agency Mortgage Servicing Rights [Member] | Conventional [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 93,901 116,029 116,029
Fair value election - transfer from MSRs carried at amortized cost 0 0  
Cumulative effect of fair value election 0 0  
Sales (68,144) 0  
Servicing transfers and adjustments 0 0  
Changes in fair value:      
Changes in valuation inputs or other assumptions [1] (580) (9,014)  
Realization of expected future cash flows and other changes [1] (6,256) (2,795)  
Ending balance 18,921 $ 104,220 93,901
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 from MSRs carried at amortized cost 787,142    
Cumulative effect of fair value election 52,015    
Sales (845)    
Servicing transfers and adjustments (1,139)    
Changes in fair value:      
Changes in valuation inputs or other assumptions [1] 0    
Realization of expected future cash flows and other changes [1] (41,644)    
Ending balance $ 795,529   $ 0
[1] Changes in fair value are recognized in Servicing and origination expense in the unaudited Consolidated Statements of Operations.