INVESTMENTS - Schedule of Investments in Loans and Securities under Fair Market Adjustments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	$ 1,040,118	$ 945,269
Investments in securities, available for sale
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	971,078	867,378
Securitization notes, available for sale
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	494,087	395,717
Securitization certificates, available for sale
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	476,991	471,661
Investments in loans and securities, under the fair value option
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	69,040	77,891
Securitization notes
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	10,420	12,473
Securitization certificates
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	46,780	60,840
Loans
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	11,840	4,578
Regulatory Risk Retention
Debt Securities, Available-for-Sale [Line Items]
Total investments in loans and securities	$ 542,100	$ 504,300