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Residential Mortgage Loans, At Fair Value - Narrative (Details) $ in Millions	Mar. 31, 2018 USD ($)
Second Mortgage
Mortgage Loans on Real Estate [Line Items]
Commitment to purchase loans from originators	$ 5.3

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- Definition

Mortgage Loans on Real Estate, Commitment To Purchase Loans From Originators

+ References

No definition available.

+ Details

Name:	nymt_MortgageLoansOnRealEstateCommitmentToPurchaseLoansFromOriginators
Namespace Prefix:	nymt_
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_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=us-gaap_SecondMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: