PORTFOLIO LOANS - Schedule of Financial Instruments Owned and Pledged as Collateral (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged loans	$ 13,673,147	$ 7,613,683
Total pledged loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged loans	7,219,053	5,579,424
FHLB
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged loans	5,454,647	4,813,600
Federal Reserve Bank
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged loans	$ 1,764,406	$ 765,824