INVESTMENTS - Transaction with Affiliated Companies (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Jan. 02, 2025
Debt Securities, Available-for-Sale [Line Items]
Fair Value	$ (1,970)	$ (96)
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Newtek Technology Solutions, Inc.
Debt Securities, Available-for-Sale [Line Items]
Consideration (in shares)	4.0		4.0	4.0
Value per share (in dollars per share)	$ 1.74		$ 1.72
Affiliate Investments
Debt Securities, Available-for-Sale [Line Items]
Cost	$ 36,294		$ 36,692
Fair Value	43,766		47,719
Non-control investments
Debt Securities, Available-for-Sale [Line Items]
Cost	10,774		11,172
Fair Value	7,266		10,469
Investment, Identifier [Axis]: Biller Genie Software, LLC
Debt Securities, Available-for-Sale [Line Items]
Cost	0		398
Fair Value	0		1,983
Investment, Identifier [Axis]: EMCAP Loan Holdings, LLC
Debt Securities, Available-for-Sale [Line Items]
Cost	306		306
Fair Value	306		306
Investment, Identifier [Axis]: Intelligent Protection Management Corp., Earnout
Debt Securities, Available-for-Sale [Line Items]
Cost	0		0
Fair Value	0		1,300
Investment, Identifier [Axis]: Intelligent Protection Management Corp., Stock
Debt Securities, Available-for-Sale [Line Items]
Cost	10,468		10,468
Fair Value	6,960		6,880
Investment, Identifier [Axis]: TSO JV
Debt Securities, Available-for-Sale [Line Items]
Cost	25,520		25,520
Fair Value	$ 36,500		$ 37,250