INVESTMENTS - Transaction with Affiliated Companies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investment Owned, Fair Value [Roll Forward]
Net Gains/(Losses)	$ 10,712	$ 3,219	$ 24,321
Affiliate Investments
Investment Owned, Fair Value [Roll Forward]
Fair Value	41,587	24,382
Proceeds from sale of loans held for sale	25,680	14,550
Return of Investment, Operating Activity	(20,301)	(564)
Net Gains/(Losses)	10,712	3,219
Fair Value	57,678	41,587	24,382
Dividend Income	1,519	1,757
Joint Ventures
Investment Owned, Fair Value [Roll Forward]
Fair Value	40,859	23,022
Proceeds from sale of loans held for sale	25,642	14,550
Return of Investment, Operating Activity	(20,185)	0
Net Gains/(Losses)	10,584	3,287
Fair Value	56,900	40,859	23,022
Dividend Income	1,503	1,641
Other Non-Control Investments
Investment Owned, Fair Value [Roll Forward]
Fair Value	728	1,360
Proceeds from sale of loans held for sale	38	0
Return of Investment, Operating Activity	(116)	(564)
Net Gains/(Losses)	128	(68)
Fair Value	778	728	1,360
Dividend Income	16	116
Investment, Identifier [Axis]: Biller Genie Software, LLC
Investment Owned, Fair Value [Roll Forward]
Fair Value	360	360
Proceeds from sale of loans held for sale	38	0
Return of Investment, Operating Activity	0	0
Net Gains/(Losses)	60	0
Fair Value	458	360	360
Dividend Income	0	0
Investment, Identifier [Axis]: EMCAP Loan Holdings, LLC
Investment Owned, Fair Value [Roll Forward]
Fair Value	368	1,000
Proceeds from sale of loans held for sale	0	0
Return of Investment, Operating Activity	(116)	(564)
Net Gains/(Losses)	68	(68)
Fair Value	320	368	1,000
Dividend Income	16	116
Investment, Identifier [Axis]: Newtek Conventional Lending, LLC
Investment Owned, Fair Value [Roll Forward]
Fair Value	19,400	16,587
Proceeds from sale of loans held for sale	0	248
Return of Investment, Operating Activity	0	0
Net Gains/(Losses)	(600)	2,565
Fair Value	18,800	19,400	16,587
Dividend Income	1,503	1,641
Investment, Identifier [Axis]: Newtek TSO II Conventional Credit Partners, LP
Investment Owned, Fair Value [Roll Forward]
Fair Value	21,459	6,435
Proceeds from sale of loans held for sale	25,642	14,302
Return of Investment, Operating Activity	(20,185)	0
Net Gains/(Losses)	11,184	722
Fair Value	38,100	21,459	$ 6,435
Dividend Income	$ 0	$ 0