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Commitments and Contingencies (Details) $ in Millions | Dec. 07, 2021 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Amount agreed to fund joint venture equity investments | $ 40.0

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- Definition Amount Agreed To Fund Joint Venture Equity Investments + References No definition available. + Details
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Namespace Prefix: | nymt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration