DERIVATIVE INSTRUMENTS - Summary of Fair Value Information about Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets
Total derivative assets	$ 964,075	$ 170,370	[1]
Liabilities
Interest rate swaps	481,696	747,036
Total derivative liabilities	826,972	881,537	[1]
Futures contracts
Assets
Other derivative assets	724,696	9,028
Total derivative assets	724,696	9,028
Liabilities
Other derivative liabilities	5,850	129,134
Total derivative liabilities	5,850	129,134
Purchase commitments
Assets
Other derivative assets	484	1,779
Total derivative assets	484	1,779
Liabilities
Other derivative liabilities	73	870
Total derivative liabilities	73	870
Interest rate swaptions
Assets
Other derivative assets	213,882	105,710
Total derivative assets	213,882	105,710
TBA derivatives
Assets
Other derivative assets	24,757	52,693
Total derivative assets	24,757	52,693
Liabilities
Other derivative liabilities	336,212	3,916
Total derivative liabilities	336,212	3,916
Credit derivatives
Assets
Other derivative assets	256	1,160
Total derivative assets		1,160
Liabilities
Other derivative liabilities	3,141	581
Total derivative liabilities	3,141	581
Credit derivatives | Maximum
Liabilities
Notional amount of credit derivatives	$ 410,000	$ 400,000

[1] (1)Derived from the audited consolidated financial statements at December 31, 2021.