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GOVERNMENT AND GOVERNMENT-BACKED SECURITIES - Summary of Real Estate Securities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 17,078,481 $ 15,878,274
Carrying Value $ 8,657,974 7,245,667
Weighted Average Life (Years) 3 years 8 months 12 days  
AFS Agency    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 68,354  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Carrying Value $ 60,630 60,135
Number of Securities | security 1  
Weighted Average Coupon 3.50%  
Weighted Average Yield 3.50%  
Weighted Average Life (Years) 11 years 2 months 12 days  
FVO Agency    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 7,827,454  
Gross Unrealized Gains 61,666  
Gross Unrealized Losses (10,200)  
Carrying Value $ 7,691,274 6,390,508
Number of Securities | security 23  
Weighted Average Coupon 5.10%  
Weighted Average Yield 5.10%  
Weighted Average Life (Years) 7 years 10 months 24 days  
FVO Non-Agency    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 3,250,000  
Gross Unrealized Gains 14,648  
Gross Unrealized Losses 0  
Carrying Value $ 3,272,031 3,260,703
Number of Securities | security 3  
Weighted Average Coupon 4.50%  
Weighted Average Yield 4.50%  
Weighted Average Life (Years) 1 year 4 months 24 days  
Agency And Non-Agency Residential Mortgage Backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 11,145,808  
Gross Unrealized Gains 76,314  
Gross Unrealized Losses (10,200)  
Carrying Value $ 11,023,935 $ 9,711,346
Number of Securities | security 27  
Weighted Average Coupon 4.90%  
Weighted Average Yield 4.90%  
Weighted Average Life (Years) 6 years