Liquid Assets, Percent Of Outstanding Repurchase Agreements

No definition available.

Name:	nymt_LiquidAssetsPercentOfOutstandingRepurchaseAgreements
Namespace Prefix:	nymt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Counterparties With Amounts Outstanding Under Repurchase Agreements

+ References

No definition available.

+ Details

Name:	nymt_NumberOfCounterpartiesWithAmountsOutstandingUnderRepurchaseAgreements
Namespace Prefix:	nymt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Repurchase Agreement Counterparty, Accrued Interest Payable

+ References

No definition available.

+ Details

Name:	nymt_RepurchaseAgreementCounterpartyAccruedInterestPayable
Namespace Prefix:	nymt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Repurchase Agreement Counterparty, Weighted Average Interest Rate Of Agreements

+ References

No definition available.

+ Details

Name:	nymt_RepurchaseAgreementCounterpartyWeightedAverageInterestRateOfAgreements
Namespace Prefix:	nymt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Repurchase Agreements, Average Interest Rate Haircut

+ References

No definition available.

+ Details

Name:	nymt_RepurchaseAgreementsAverageInterestRateHaircut
Namespace Prefix:	nymt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of counterparties the entity has repurchase agreements with.

+ References

No definition available.

+ Details

Name:	nymt_RepurchaseAgreementsNumberOfCounterparties
Namespace Prefix:	nymt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Repurchase Agreements, Number Of Financial Institutions

+ References

No definition available.

+ Details

Name:	nymt_RepurchaseAgreementsNumberOfFinancialInstitutions
Namespace Prefix:	nymt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Repurchase Agreements, Weighted Average Advance Rate

+ References

No definition available.

+ Details

Name:	nymt_RepurchaseAgreementsWeightedAverageAdvanceRate
Namespace Prefix:	nymt_
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

No definition available.

+ Details

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

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(iii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepurchaseAgreementCounterpartyWeightedAverageMaturityOfAgreements1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after the effects of master netting arrangements, of securities borrowed from entities in exchange for collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

+ Details

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

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_RepurchaseAgreementsMember
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:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Repurchase Agreements - Narrative (Details) $ in Thousands	3 Months Ended
Repurchase Agreements - Narrative (Details) $ in Thousands	Mar. 31, 2022 USD ($) financialInstitution counterparty	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, number of financial institutions \| financialInstitution	3
Repurchase agreements, number of counterparties \| counterparty	2
Number of counterparties with amounts outstanding under repurchase agreements \| counterparty	2
Cash and cash equivalents	$ 303,762	$ 289,602	$ 290,977
Liquid assets, percent of outstanding repurchase agreements	267.70%
Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Average days to maturity	10 days
Weighted average interest rate	1.73%
Accrued interest payable	$ 400
Weighted average advance rate	51.70%
Average interest rate haircut	48.30%
Cash and cash equivalents	$ 303,800
Unencumbered investment securities	$ 84,078
Repurchase agreements \| Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Average interest rate haircut	48.80%
Unencumbered investment securities	$ 45,373
Repurchase agreements \| CMBS
Assets Sold under Agreements to Repurchase [Line Items]
Average interest rate haircut	45.00%
Unencumbered investment securities	$ 0