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Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

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Amount of unrealized gain (loss) on investment in debt and equity securities.

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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INVESTMENTS - Narrative (Details)		6 Months Ended		12 Months Ended
INVESTMENTS - Narrative (Details)	Aug. 27, 2025 USD ($)	Jun. 30, 2026 USD ($) shares	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) shares	Apr. 23, 2025 USD ($)	Jan. 02, 2025 USD ($) representative shares	Jul. 23, 2024 USD ($)	Jan. 28, 2022 USD ($)	May 20, 2019
Debt Securities, Available-for-Sale [Line Items]
Convertible shares issuable (in shares) \| shares						1
Fair Value		$ (1,970,000)	$ (96,000)
Number of representatives \| representative						1
Accrued interest receivable on available-for-sale securities		0		$ 0
Class A Notes
Debt Securities, Available-for-Sale [Line Items]
Notes sold					$ 155,900,000		$ 137,200,000
Class B Notes
Debt Securities, Available-for-Sale [Line Items]
Notes sold					$ 23,800,000		17,200,000
TSO Notes
Debt Securities, Available-for-Sale [Line Items]
Collateral							$ 190,500,000
Investment, Identifier [Axis]: Biller Genie Software, LLC
Debt Securities, Available-for-Sale [Line Items]
Fair Value		0		1,983,000
Investment, Identifier [Axis]: EMCAP Loan Holdings, LLC
Debt Securities, Available-for-Sale [Line Items]
Fair Value		306,000		306,000
Investment, Identifier [Axis]: Intelligent Protection Management Corp., Earnout
Debt Securities, Available-for-Sale [Line Items]
Fair Value		0		1,300,000
Investment, Identifier [Axis]: Intelligent Protection Management Corp., Stock
Debt Securities, Available-for-Sale [Line Items]
Fair Value		6,960,000		6,880,000
Investment, Identifier [Axis]: TSO JV
Debt Securities, Available-for-Sale [Line Items]
Fair Value		$ 36,500,000		$ 37,250,000
Conventional Lending TCP Holding
Debt Securities, Available-for-Sale [Line Items]
Ownership interest, percentage	50.00%
Ownership interest, consideration	$ 15,750,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Newtek Technology Solutions, Inc.
Debt Securities, Available-for-Sale [Line Items]
Consideration						$ 4,000,000.0
Consideration (in shares) \| shares		4,000,000		4,000,000		4,000,000.0
Earn-out receivable						$ 5,000,000.0
Newtek Conventional Lending, LLC
Debt Securities, Available-for-Sale [Line Items]
Investment sale								$ 56,300,000
Yield percentage								3.209%
Newtek ALP Holdings \| Conventional Lending TCP Holding
Debt Securities, Available-for-Sale [Line Items]
Ownership interest, percentage	100.00%
Newtek Conventional Lending, LLC \| Newtek Commercial Lending
Debt Securities, Available-for-Sale [Line Items]
Joint venture ownership percentage									50.00%
Newtek Conventional Lending, LLC \| Conventional Lending TCP Holding
Debt Securities, Available-for-Sale [Line Items]
Joint venture ownership percentage									50.00%