SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on agency mortgage-backed securities	$ 561,927	$ 1,723,713	$ 1,456,242	$ 160,841
Residential Investment securities sold, carrying value	1,300,000	2,800,000	9,700,000	16,000,000
Agency
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on agency mortgage-backed securities	$ 621,800	$ 1,700,000	$ 1,600,000	$ 762,800