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DERIVATIVE INSTRUMENTS - Summary of Fair Value Information about Derivative Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets    
Total derivative assets $ 549,833 $ 342,064 [1]
Liabilities    
Interest rate swaps 9,300 108,724
Total derivative liabilities 97,616 204,172 [1]
Futures contracts    
Assets    
Other derivative assets 256,778 33,179
Total derivative assets 256,778 33,179
Liabilities    
Other derivative liabilities 38,062 11,919
Total derivative liabilities 38,062 11,919
Futures contracts | Secured Overnight Financing Rate (SOFR)    
Liabilities    
Other derivative liabilities 38,100  
Purchase commitments    
Assets    
Other derivative assets 4,766 1,832
Total derivative assets 4,766 1,832
Liabilities    
Other derivative liabilities 3,519 460
Total derivative liabilities 3,519 460
Interest rate swaps    
Assets    
Interest rate swaps 95,553 33,006
Total derivative assets 95,553 33,006
Liabilities    
Total derivative liabilities 9,300 108,724
Current notional 57,719,554 52,277,300
Interest rate swaptions    
Assets    
Other derivative assets 185,504 256,991
Total derivative assets 185,504 256,991
TBA derivatives    
Assets    
Other derivative assets 7,232 17,056
Total derivative assets 7,232 17,056
Liabilities    
Other derivative liabilities 46,735 69,270
Total derivative liabilities 46,735 69,270
Credit derivatives    
Liabilities    
Other derivative liabilities $ 0 13,799
Total derivative liabilities   13,799
Credit derivatives | Maximum    
Liabilities    
Current notional   $ 420,000
[1] (1)Derived from the audited consolidated financial statements at December 31, 2022.