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Residential Mortgage Securities and MSR-Related Assets (Unrealized Losses) (Details)
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
Fair Value    
Less than 12 Months $ 268,024,000  
12 Months or more 0  
Total 268,024,000  
Unrealized Losses    
Less than 12 Months 89,388,000  
12 Months or more 0  
Total $ 89,388,000  
Number of Securities    
Less than 12 months (in security) | security 54  
12 months or more (in security) | security 0  
Available-for-sale securities $ 1,927,454,000 $ 3,983,519,000
Gross unrealized losses 89,388,000 18,818,000
Agency MBS    
Fair Value    
Less than 12 Months 0  
12 Months or more 0  
Total 0  
Unrealized Losses    
Less than 12 Months 0  
12 Months or more 0  
Total $ 0  
Number of Securities    
Less than 12 months (in security) | security 0  
12 months or more (in security) | security 0  
Available-for-sale securities $ 553,413,000 1,664,582,000
Gross unrealized losses 0 18,709,000
Agency MBS | Fannie Mae    
Fair Value    
Less than 12 Months 0  
12 Months or more 0  
Total 0  
Unrealized Losses    
Less than 12 Months 0  
12 Months or more 0  
Total $ 0  
Number of Securities    
Less than 12 months (in security) | security 0  
12 months or more (in security) | security 0  
Available-for-sale securities $ 448,258,000 1,157,993,000
Gross unrealized losses 0 14,741,000
Agency MBS | Freddie Mac    
Fair Value    
Less than 12 Months 0  
12 Months or more 0  
Total 0  
Unrealized Losses    
Less than 12 Months 0  
12 Months or more 0  
Total $ 0  
Number of Securities    
Less than 12 months (in security) | security 0  
12 months or more (in security) | security 0  
Available-for-sale securities $ 101,277,000 502,468,000
Gross unrealized losses 0 3,968,000
Agency MBS | Ginnie Mae    
Fair Value    
Less than 12 Months 0  
12 Months or more 0  
Total 0  
Unrealized Losses    
Less than 12 Months 0  
12 Months or more 0  
Total $ 0  
Number of Securities    
Less than 12 months (in security) | security 0  
12 months or more (in security) | security 0  
Available-for-sale securities $ 3,878,000 4,121,000
Gross unrealized losses 0 0
Non-Agency MBS    
Fair Value    
Less than 12 Months 79,464,000  
12 Months or more 0  
Total 79,464,000  
Unrealized Losses    
Less than 12 Months 21,643,000  
12 Months or more 0  
Total $ 21,643,000  
Number of Securities    
Less than 12 months (in security) | security 7  
12 months or more (in security) | security 0  
Available-for-sale securities $ 1,119,940,000 2,063,529,000
Gross unrealized losses 21,643,000 18,000
Expected to Recover Par    
Fair Value    
Less than 12 Months 79,464,000  
12 Months or more 0  
Total 79,464,000  
Unrealized Losses    
Less than 12 Months 21,643,000  
12 Months or more 0  
Total $ 21,643,000  
Number of Securities    
Less than 12 months (in security) | security 7  
12 months or more (in security) | security 0  
Available-for-sale securities $ 121,522,000 725,668,000
Gross unrealized losses 21,643,000 9,000
Expected to Recover Less Than Par    
Fair Value    
Less than 12 Months 0  
12 Months or more 0  
Total 0  
Unrealized Losses    
Less than 12 Months 0  
12 Months or more 0  
Total $ 0  
Number of Securities    
Less than 12 months (in security) | security 0  
12 months or more (in security) | security 0  
Available-for-sale securities $ 998,418,000 1,337,861,000
Gross unrealized losses 0 9,000
Total MBS    
Fair Value    
Less than 12 Months 79,464,000  
12 Months or more 0  
Total 79,464,000  
Unrealized Losses    
Less than 12 Months 21,643,000  
12 Months or more 0  
Total $ 21,643,000  
Number of Securities    
Less than 12 months (in security) | security 7  
12 months or more (in security) | security 0  
Available-for-sale securities $ 1,673,353,000 3,728,111,000
Gross unrealized losses 21,643,000 18,727,000
CRT securities    
Fair Value    
Less than 12 Months 188,560,000  
12 Months or more 0  
Total 188,560,000  
Unrealized Losses    
Less than 12 Months 67,745,000  
12 Months or more 0  
Total $ 67,745,000  
Number of Securities    
Less than 12 months (in security) | security 47  
12 months or more (in security) | security 0  
Available-for-sale securities $ 254,101,000 255,408,000
Gross unrealized losses 67,745,000 $ 91,000
CRT in Loss Positions Only, Fair Value Option    
Number of Securities    
Available-for-sale securities 188,600,000  
Gross unrealized losses $ 67,700,000