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SECURITIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on agency mortgage-backed securities	$ (2,125,618)	$ (4,602,456)	$ 120,958
Residential investment securities sold, carrying value	36,400,000	28,900,000
Agency Securities
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on agency mortgage-backed securities	$ 611,500	(665,600)
Commercial securities
Debt Securities, Available-for-sale [Line Items]
Impairment on commercial mortgage-backed security		$ 0	$ 400	$ 0

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