Derivative Instruments - Schedule of Interest Rate Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 4,081,217	$ 2,724,965
Weighted Average Fixed Interest Rate	4.09%	4.36%
Weighted Average Variable Interest Rate	4.82%	5.34%
Fixed Rate Payments
Derivative [Line Items]
Notional Amount	$ 53,050	$ 53,050
Weighted Average Fixed Interest Rate	3.61%	3.61%
Weighted Average Variable Interest Rate	5.04%	5.33%
2025 \| Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 1,377,250	$ 1,476,370
Weighted Average Fixed Interest Rate	4.53%	4.62%
Weighted Average Variable Interest Rate	4.89%	5.33%
2026 \| Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 159,120	$ 214,985
Weighted Average Fixed Interest Rate	4.10%	4.19%
Weighted Average Variable Interest Rate	4.53%	5.33%
2027 \| Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 622,123
Weighted Average Fixed Interest Rate	3.98%
Weighted Average Variable Interest Rate	4.75%
2028 \| Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 510,325	$ 674,804
Weighted Average Fixed Interest Rate	3.90%	4.03%
Weighted Average Variable Interest Rate	4.93%	5.35%
2028 \| Fixed Rate Payments
Derivative [Line Items]
Notional Amount	$ 9,550	$ 9,550
Weighted Average Fixed Interest Rate	3.48%	3.48%
Weighted Average Variable Interest Rate	5.15%	5.29%
2029 \| Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 614,585
Weighted Average Fixed Interest Rate	3.86%
Weighted Average Variable Interest Rate	4.71%
2033 \| Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 319,590	$ 358,806
Weighted Average Fixed Interest Rate	4.00%	4.04%
Weighted Average Variable Interest Rate	4.83%	5.34%
2033 \| Fixed Rate Payments
Derivative [Line Items]
Notional Amount	$ 43,500	$ 43,500
Weighted Average Fixed Interest Rate	3.64%	3.64%
Weighted Average Variable Interest Rate	5.01%	5.33%
2034 \| Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 178,224
Weighted Average Fixed Interest Rate	3.86%
Weighted Average Variable Interest Rate	4.83%
2044 \| Floating Rate Payments
Derivative [Line Items]
Notional Amount	$ 300,000
Weighted Average Fixed Interest Rate	3.34%
Weighted Average Variable Interest Rate	4.80%

Average fixed interest rate related to the group of interest rate derivatives.

No definition available.

Name:	us-gaap_DerivativeAverageFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Average variable interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	nymt_DerivativePaymentTypeAxis=nymt_FloatingRatePaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nymt_DerivativePaymentTypeAxis=nymt_FixedRatePaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=nymt_SwapMaturities2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=nymt_SwapMaturities2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=nymt_SwapMaturities2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=nymt_SwapMaturities2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=nymt_SwapMaturities2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=nymt_SwapMaturities2033Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=nymt_SwapMaturities2034Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=nymt_SwapMaturities2044Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: