DEPOSITS - Schedule of Composition of Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Deposits [Abstract]
Noninterest-bearing demand deposits	$ 3,554,936	$ 2,719,907
Interest-bearing transaction deposits	3,171,255	2,423,237
Saving deposits and money market deposits	5,910,183	3,348,711
Time deposits	2,433,788	1,490,635
Total deposits	15,070,162	9,982,490
Brokered interest-bearing transaction deposits	50,240	0
Brokered savings deposits and money market deposits	10,000	6,002
Brokered time deposits	65,192	7,088
Aggregate amount of time deposits with a minimum denomination of $100,000	1,621,232	860,193
Aggregate amount of time deposits with a minimum denomination that meets or exceeds the FDIC insurance limit of $250,000	$ 807,378	$ 334,503