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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance $ 93,901,000    
Sales   $ 0  
Changes in fair value:      
Ending balance 787,344,000   $ 93,901,000
Conventional [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 93,901,000    
Fair value election - transfer from MSRs carried at amortized cost 787,142,000    
Cumulative effect of fair value election 52,015,000    
Sales (71,318,000)    
Servicing transfers and adjustments (1,139,000)    
Changes in fair value:      
Changes in valuation inputs or other assumptions [1] 9,439,000    
Realization of expected future cash flows and other changes [1] (82,696,000)    
Ending balance 787,344,000   93,901,000
Fair Value Agency Mortgage Servicing Rights [Member] | Conventional [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Beginning balance 93,901,000 116,029,000 116,029,000
Fair value election - transfer from MSRs carried at amortized cost 0 0  
Cumulative effect of fair value election 0 0  
Sales (70,084,000) 0  
Servicing transfers and adjustments 0 (934,000)  
Changes in fair value:      
Changes in valuation inputs or other assumptions [1] (2,592,000) (12,217,000)  
Realization of expected future cash flows and other changes [1] (6,808,000) (930,000)  
Ending balance 14,417,000 $ 101,948,000 93,901,000
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 787,142,000    
Cumulative effect of fair value election 52,015,000    
Sales (1,234,000)    
Servicing transfers and adjustments (1,139,000)    
Changes in fair value:      
Changes in valuation inputs or other assumptions [1] 12,031,000    
Realization of expected future cash flows and other changes [1] (75,888,000)    
Ending balance $ 772,927,000   $ 0
[1] Changes in fair value are recognized in Servicing and origination expense in the Unaudited Consolidated Statements of Operations.