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Residential Mortgage Securities and MSR-Related Assets (Unrealized Losses) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
Fair Value    
Less than 12 Months $ 103,391  
12 Months or more 0  
Total 103,391  
Unrealized Losses    
Less than 12 Months 1,183  
12 Months or more 0  
Total $ 1,183  
Number of Securities    
Less than 12 months (in security) | security 12  
12 months or more (in security) | security 0  
Fair Value $ 161,000 $ 3,983,519
Gross unrealized losses 1,183 18,818
Non-Agency MBS    
Fair Value    
Less than 12 Months 41,139  
12 Months or more 0  
Total 41,139  
Unrealized Losses    
Less than 12 Months 861  
12 Months or more 0  
Total $ 861  
Number of Securities    
Less than 12 months (in security) | security 4  
12 months or more (in security) | security 0  
Fair Value $ 56,766 2,063,529
Gross unrealized losses 861 18
CRT securities    
Fair Value    
Less than 12 Months 62,252  
12 Months or more 0  
Total 62,252  
Unrealized Losses    
Less than 12 Months 322  
12 Months or more 0  
Total $ 322  
Number of Securities    
Less than 12 months (in security) | security 8  
12 months or more (in security) | security 0  
Fair Value $ 104,234 255,408
Gross unrealized losses 322 $ 91
CRT in Loss Positions Only, Fair Value Option    
Number of Securities    
Fair Value 62,200  
Gross unrealized losses $ 322,000