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Investments in Servicing Related Assets (Details)
$ in Thousands
3 Months Ended
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Feb. 28, 2014
USD ($)
Mar. 31, 2017
USD ($)
Portfolio
Dec. 31, 2016
USD ($)
May 29, 2015
USD ($)
Oct. 31, 2013
USD ($)
Investment [Line Items]              
Mortgage loans with an outstanding principal balance         $ 1,640    
Aurora Financial Group, Inc [Member]              
Investment [Line Items]              
Aggregate unpaid principal balance           $ 718,400  
Excess MSR Pool 1 [Member]              
Investment [Line Items]              
Mortgage loans with an outstanding principal balance             $ 10,000,000
Weighted average mortgage servicing amount on unpaid balance             0.28%
Amount representing reasonable compensation for performing the servicing duties             0.08%
Excess mortgage servicing amount             0.20%
Excess MSR Pool 1 [Member] | Aurora Financial Group, Inc [Member]              
Investment [Line Items]              
Acquired servicing rights, excess mortgage servicing amount       85.00%      
Refinancing of loans       $ 60,600      
Percentage of co-investment in excess MSRs, pari passu       15.00%      
Excess MSR Pool 2 [Member]              
Investment [Line Items]              
Mortgage loans with an outstanding principal balance             $ 10,700,000
Weighted average mortgage servicing amount on unpaid balance             0.44%
Amount representing reasonable compensation for performing the servicing duties             0.10%
Excess mortgage servicing amount             0.34%
Excess MSR Pool 2 [Member] | Aurora Financial Group, Inc [Member]              
Investment [Line Items]              
Acquired servicing rights, excess mortgage servicing amount       50.00%      
Refinancing of loans       $ 38,400      
Percentage of co-investment in excess MSRs, pari passu       50.00%      
Freedom Mortgage Excess Service Right [Member]              
Investment [Line Items]              
Aggregate unpaid principal balance $ 98,100 $ 159,800 $ 76,800        
Excess mortgage servicing acquired 85.00% 71.00% 85.00%        
Excess mortgage servicing acquired, amount $ 661 $ 946 $ 567        
Mortgage Servicing Rights (MSRs) [Member] | Aurora Financial Group, Inc [Member]              
Investment [Line Items]              
Mortgage loans with an outstanding principal balance       $ 3,100,000      
Number of portfolios | Portfolio       3