Assets Sold Under Agreements To Repurchase, Amortized Cost Of Collateral Pledged

No definition available.

Name:	nymt_AssetsSoldUnderAgreementsToRepurchaseAmortizedCostOfCollateralPledged
Namespace Prefix:	nymt_
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

+ Details

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

- Definition

Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(ii)(A)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

+ Details

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

- Definition

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

+ Details

Name:	us-gaap_MortgageLoansOnRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=nymt_AgencyRMBSAndNonAgencyRMBSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=nymt_AgencyResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=nymt_NonAgencyRMBSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=nymt_ResidentialLoanSecuritizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nymt_ConsolidatedSLSTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Repurchase Agreements - Repurchase Agreements Secured by Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	$ 1,862,063	$ 50,077
Fair Value of Collateral Pledged	3,084,303	3,525,080	$ 3,575,601	$ 3,049,166
Agency RMBS And Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	1,862,063	50,077
Fair Value of Collateral Pledged	2,076,435	170,551
Amortized Cost of Collateral Pledged	2,102,412	210,733
Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	1,771,436	0
Fair Value of Collateral Pledged	1,894,052	0
Amortized Cost of Collateral Pledged	1,869,415	0
Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	90,627	50,077
Fair Value of Collateral Pledged	182,383	170,551
Amortized Cost of Collateral Pledged	232,997	210,733
Non-Agency RMBS \| Residential Loan Securitizations
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged	42,100
Non-Agency RMBS \| Consolidated SLST
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged	$ 140,300	$ 170,600