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DERIVATIVE INSTRUMENTS - Summary of Fair Value Information about Derivative Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Assets    
Total derivative assets $ 203,799 $ 162,557 [1]
Liabilities    
Interest rate swaps 20,931 83,051
Total derivative liabilities 103,142 302,295 [1]
Futures contracts    
Assets    
Other derivative assets 8,636 0
Total derivative assets 8,636  
Liabilities    
Other derivative liabilities 69,565 179,835
Total derivative liabilities 69,565 179,835
Futures contracts | Secured Overnight Financing Rate (SOFR)    
Assets    
Other derivative assets 1,300  
Liabilities    
Other derivative liabilities 26,800  
Purchase commitments    
Assets    
Other derivative assets 4,633 9,641
Total derivative assets 4,633 9,641
Liabilities    
Other derivative liabilities 1,943 339
Total derivative liabilities 1,943 339
Interest rate swaps    
Assets    
Interest rate swaps 46,796 26,344
Total derivative assets 46,796 26,344
Liabilities    
Total derivative liabilities 20,931 83,051
Current notional 55,097,271 58,829,554
Interest rate swaptions    
Assets    
Other derivative assets 136,514 105,883
Total derivative assets 136,514 105,883
TBA derivatives    
Assets    
Other derivative assets 7,220 20,689
Total derivative assets 7,220 20,689
Liabilities    
Other derivative liabilities 10,703 39,070
Total derivative liabilities $ 10,703 $ 39,070
[1]
(1)Derived from the audited consolidated financial statements at December 31, 2023.