INVESTMENTS - Transaction with Affiliated Companies (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jan. 02, 2025	Aug. 11, 2024
Debt Securities, Available-for-Sale [Line Items]
Net Gains/(Losses)	$ (4,405)	$ 10,712	$ 3,219
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Newtek Technology Solutions, Inc.
Debt Securities, Available-for-Sale [Line Items]
Earn-out amount				$ 2,268
Consideration (in shares)	4.0			4.0	4.0
Value per share (in dollars per share)	$ 1.72			$ 2.05
Affiliate Investments
Debt Securities, Available-for-Sale [Line Items]
Fair Value	$ 47,719	57,678
Net Gains/(Losses)	(4,405)	10,712
Joint Ventures
Debt Securities, Available-for-Sale [Line Items]
Fair Value	37,250	56,900
Net Gains/(Losses)	(3,642)	10,584
Other Investments
Debt Securities, Available-for-Sale [Line Items]
Fair Value	10,469	778
Net Gains/(Losses)	(763)	128
Investment, Identifier [Axis]: Biller Genie Software, LLC
Debt Securities, Available-for-Sale [Line Items]
Fair Value	1,983	458
Net Gains/(Losses)	1,525	60
Investment, Identifier [Axis]: EMCAP Loan Holdings, LLC
Debt Securities, Available-for-Sale [Line Items]
Fair Value	306	320
Net Gains/(Losses)	0	68
Investment, Identifier [Axis]: Intelligent Protection Management Corp., Earnout
Debt Securities, Available-for-Sale [Line Items]
Fair Value	1,300	0
Net Gains/(Losses)	(968)	0
Investment, Identifier [Axis]: Intelligent Protection Management Corp., Stock
Debt Securities, Available-for-Sale [Line Items]
Fair Value	6,880	0
Net Gains/(Losses)	(1,320)	0
Investment, Identifier [Axis]: NCL JV
Debt Securities, Available-for-Sale [Line Items]
Fair Value	0	18,800
Net Gains/(Losses)	(2,792)	(600)
Investment, Identifier [Axis]: TSO JV
Debt Securities, Available-for-Sale [Line Items]
Fair Value	37,250	38,100
Net Gains/(Losses)	$ (850)	$ 11,184