NEWTEKONE, INC. - PARENT COMPANY ONLY - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Aug. 07, 2025	Dec. 31, 2024
Other Commitments [Line Items]
Principal amount	$ 829,452
Funded account	10,000
Capital One Facilities | Line of Credit
Other Commitments [Line Items]
Principal balance	16,600		$ 21,300
Capital One Facilities | Line of Credit | Capital One, SP1
Other Commitments [Line Items]
Maximum borrowing capacity	100,000		60,000
Borrowings Outstanding - line of credit	16,600
NBL Deutsche Bank Facility | Line of Credit | Payment guarantee
Other Commitments [Line Items]
Guaranty liabilities	169,800
NBL One Florida Bank Facility | Line of Credit | Payment guarantee
Other Commitments [Line Items]
Guaranty liabilities	33,300
NMS Goldman Facility | Line of Credit
Other Commitments [Line Items]
Principal amount	95,000		0
Principal balance	89,775		$ 0
Newtek Business Lending, LLC | NBL Deutsche Bank Facility | Line of Credit
Other Commitments [Line Items]
Maximum borrowing capacity	170,000
Newtek Business Lending, LLC | NBL One Florida Bank Facility | Line of Credit
Other Commitments [Line Items]
Maximum borrowing capacity	$ 35,000	$ 30,000