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SECURITIES - Summary of Residential Securities and CMBS (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Debt Securities, Available-For-Sale [Roll Forward]  
Beginning balance January 1, 2024 $ 69,613,565 [1],[2]
Purchases 7,060,158
Sales (8,168,444)
Principal paydowns (1,424,013)
(Amortization) / accretion (26,390)
Fair value adjustment (554,187)
Ending balance March 31, 2024 66,500,689 [2]
Agency Securities  
Debt Securities, Available-For-Sale [Roll Forward]  
Beginning balance January 1, 2024 66,308,788
Purchases 6,816,858
Sales (7,625,781)
Principal paydowns (1,306,242)
(Amortization) / accretion (29,893)
Fair value adjustment (621,500)
Ending balance March 31, 2024 63,542,230
Residential Credit Securities  
Debt Securities, Available-For-Sale [Roll Forward]  
Beginning balance January 1, 2024 3,082,333
Purchases 243,300
Sales (473,895)
Principal paydowns (115,392)
(Amortization) / accretion 3,161
Fair value adjustment 65,824
Ending balance March 31, 2024 2,805,331
Commercial Securities  
Debt Securities, Available-For-Sale [Roll Forward]  
Beginning balance January 1, 2024 222,444
Purchases 0
Sales (68,768)
Principal paydowns (2,379)
(Amortization) / accretion 342
Fair value adjustment 1,489
Ending balance March 31, 2024 $ 153,128
[1]
(1)Derived from the audited consolidated financial statements at December 31, 2023.
[2]
(3)Excludes $1.8 billion and $1.5 billion at March 31, 2024 and December 31, 2023, respectively, of non-Agency mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.