SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Residuals of Securitization (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Assets	$ 76,701	$ 0
Maximum Exposure to Loss	76,701
Total Assets in VIE	$ 202,015

Residuals In Securitization, Total Assets in Variable Interest Entity

No definition available.

Name:	newt_ResidualsInSecuritizationTotalAssetsInVariableInterestEntity
Namespace Prefix:	newt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant