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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Securitized Debt (Details) - USD ($) | Sep. 30, 2019 | Mar. 25, 2019 | Mar. 14, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Carrying value | $ 0 |  |  | $ 42,335,000
Multi-family CMBS Re-securitization |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal amount |  |  | $ 33,200,000 | 33,177,000
Carrying value |  |  |  | $ 30,121,000
Multi-family CMBS Re-securitization | LIBOR |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Pass-through rate of notes issued |  |  |  | 5.35%
Distressed Residential Mortgage Loan Securitization |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal amount |  | $ 6,500,000 |  | $ 12,381,000
Carrying value |  |  |  | $ 12,214,000
Distressed Residential Mortgage Loan Securitization | LIBOR |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Pass-through rate of notes issued |  |  |  | 4.00%
Variable Interest Entity, Securitized Debt |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal amount | $ 0 |  |  |
Unamortized deferred finance costs |  |  |  | $ 200,000

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- Definition The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109249708&loc=d3e113275-111724 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_CollateralizedFinancings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This is the principal amount outstanding for securitized loans only (across all types of loans). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOnLoansSecuritized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=nymt_MultifamilyCMBSResecuritizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=nymt_DistressedResidentialMortgageLoanSecuritizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=nymt_VariableInterestEntitySecuritizedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |