DERIVATIVE INSTRUMENTS - Summary of Fair Value Information about Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Interest rate swaps	$ 33,006	$ 0
Total derivative assets	342,064	170,370
Interest rate swaps	108,724	747,036
Total derivative liabilities	204,172	881,537
Futures contracts
Derivatives, Fair Value [Line Items]
Derivative assets	33,179	9,028
Total derivative assets	33,179	9,028
Derivative liabilities	11,919	129,134
Total derivative liabilities	11,919	129,134
Purchase commitments
Derivatives, Fair Value [Line Items]
Derivative assets	1,832	1,779
Total derivative assets	1,832	1,779
Derivative liabilities	460	870
Total derivative liabilities	460	870
Interest rate swaptions
Derivatives, Fair Value [Line Items]
Derivative assets	256,991	105,710
Total derivative assets	256,991	105,710
TBA derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	17,056	52,693
Total derivative assets	17,056	52,693
Derivative liabilities	69,270	3,916
Total derivative liabilities	69,270	3,916
Credit derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	0	1,160
Total derivative assets		1,160
Derivative liabilities	13,799	581
Total derivative liabilities	13,799	581
Credit derivatives | Maximum
Derivatives, Fair Value [Line Items]
Current Notional	$ 420,000	$ 400,000