SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on agency mortgage-backed securities	$ 83,503	$ (568,745)	$ 894,315	$ (1,562,872)
Residential Investment securities sold, carrying value	3,300,000	5,200,000	8,500,000	13,300,000
Agency
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on agency mortgage-backed securities	$ 113,100	$ (274,900)	$ 1,000,000	$ (948,900)