Debt Instrument, Maximum Borrowing Capacity, Amount Outstanding

No definition available.

Name:	newt_DebtInstrumentMaximumBorrowingCapacityAmountOutstanding
Namespace Prefix:	newt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long-Term Line of Credit, Net of Deferred Financing Costs

+ References

No definition available.

+ Details

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Namespace Prefix:	newt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

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Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
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Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

BORROWINGS - Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Feb. 18, 2026	Jan. 28, 2026	Dec. 31, 2025	Jul. 28, 2025	Jan. 31, 2021
Debt Instrument [Line Items]
Total	$ 582,303			$ 926,635
Net carrying amount1	$ 554,192			$ 819,888
Weighted Avg Interest Rate	8.12%			7.53%
Secured Debt
Debt Instrument [Line Items]
Commitments - Notes	$ 270,573			$ 542,827
Net carrying amount1	$ 247,068			$ 441,241
Weighted Avg Interest Rate	7.79%			7.82%
Secured Debt \| Securitization Trusts
Debt Instrument [Line Items]
Commitments - Notes	$ 106,573			$ 128,827
Net carrying amount1	$ 105,099			$ 127,050
Weighted Avg Interest Rate	6.27%			6.42%
Secured Debt \| FHLB Advances
Debt Instrument [Line Items]
Commitments - Notes	$ 14,000			$ 14,000
Net carrying amount1	$ 6,310			$ 7,349
Weighted Avg Interest Rate	2.65%			2.75%
Line of Credit \| NMS Goldman Facility
Debt Instrument [Line Items]
Commitments - Notes	$ 95,000			$ 95,000
Net carrying amount1	$ 88,009			$ 88,352
Weighted Avg Interest Rate	9.16%			9.42%
Line of Credit \| Capital One Facilities \| Capital One, SP1
Debt Instrument [Line Items]
Commitments - line of credit	$ 0			$ 100,000	$ 100,000
Borrowings Outstanding - line of credit	$ 0			$ 16,085
Weighted Avg Interest Rate	0.00%			6.59%
Line of Credit \| Deutsche Bank Line of Credit
Debt Instrument [Line Items]
Commitments - line of credit	$ 0			$ 170,000
Borrowings Outstanding - line of credit	$ 0			$ 169,146
Weighted Avg Interest Rate	0.00%			7.32%
Line of Credit \| One Florida line of credit - SP3
Debt Instrument [Line Items]
Commitments - line of credit	$ 35,000			$ 35,000
Borrowings Outstanding - line of credit	$ 28,116			$ 33,259
Weighted Avg Interest Rate	7.75%			7.75%
Line of Credit \| D2 Facility
Debt Instrument [Line Items]
Commitments - line of credit	$ 20,000			$ 0
Borrowings Outstanding - line of credit	$ 19,534			$ 0
Weighted Avg Interest Rate	11.50%			0.00%
Medium-term Notes
Debt Instrument [Line Items]
Commitments - Notes	$ 311,730			$ 383,808
Net carrying amount1	$ 307,124			$ 378,647
Weighted Avg Interest Rate	8.379%			7.35%
Medium-term Notes \| 2026 Notes
Debt Instrument [Line Items]
Commitments - Notes	$ 0			$ 95,000
Net carrying amount1	$ 0			$ 95,000
Weighted Avg Interest Rate	5.50%			5.50%		5.50%
Medium-term Notes \| 2027 Notes
Debt Instrument [Line Items]
Commitments - Notes	$ 50,000			$ 50,000
Net carrying amount1	$ 49,982			$ 49,967
Weighted Avg Interest Rate	8.125%			8.125%
Medium-term Notes \| 2028 Notes (8.00%)
Debt Instrument [Line Items]
Commitments - Notes	$ 40,000			$ 40,000
Net carrying amount1	$ 39,247			$ 39,073
Weighted Avg Interest Rate	8.00%			8.00%
Medium-term Notes \| 2029 8.50% Notes
Debt Instrument [Line Items]
Commitments - Notes	$ 71,808			$ 71,808
Net carrying amount1	$ 70,321			$ 70,066
Weighted Avg Interest Rate	8.50%			8.50%
Medium-term Notes \| 2029 8.625% Notes
Debt Instrument [Line Items]
Commitments - Notes	$ 75,000			$ 75,000
Net carrying amount1	$ 73,393			$ 73,150
Weighted Avg Interest Rate	8.625%			8.625%
Medium-term Notes \| 2030 8.375% Notes
Debt Instrument [Line Items]
Commitments - Notes	$ 52,000			$ 52,000
Net carrying amount1	$ 51,463			$ 51,391
Weighted Avg Interest Rate	8.375%			8.375%
Medium-term Notes \| 2031 8.50% Notes
Debt Instrument [Line Items]
Commitments - Notes	$ 7,922			$ 0
Net carrying amount1	$ 7,836			$ 0
Weighted Avg Interest Rate	8.50%		8.50%	0.00%
Medium-term Notes \| 2033 8.375% Notes
Debt Instrument [Line Items]
Commitments - Notes	$ 15,000			$ 0
Net carrying amount1	$ 14,882			$ 0
Weighted Avg Interest Rate	8.375%	8.375%		0.00%