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Residential Mortgage Loans, At Fair Value - Narrative (Details) $ in Millions | Mar. 31, 2018 USD ($)
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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: |