FAIR VALUE MEASUREMENT - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Assets:
Investments in loans and securities	$ 870,061		$ 778,409
Liabilities:
Warrant liability	2,471	$ 1,992	893	$ 1,671	$ 1,342	$ 3,242
Other liabilities	6,697		6,090
Accrued interest receivable	18,000		14,300
Level 1
Liabilities:
Warrant liability	2,471		890
Other liabilities	0		0
Level 2
Liabilities:
Warrant liability	0		3
Other liabilities	0		0
Level 3
Liabilities:
Warrant liability	0		0
Other liabilities	6,697		6,090
Notes
Assets:
Investments in loans and securities	321,195		240,274
Notes | Level 1
Assets:
Investments in loans and securities	0		0
Notes | Level 2
Assets:
Investments in loans and securities	133,326		115,220
Notes | Level 3
Assets:
Investments in loans and securities	187,869		125,054
Certificates
Assets:
Investments in loans and securities	547,101		533,243
Certificates | Level 1
Assets:
Investments in loans and securities	0		0
Certificates | Level 2
Assets:
Investments in loans and securities	0
Certificates | Level 3
Assets:
Investments in loans and securities	$ 547,101		$ 533,243