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Commitments and Contingencies (Details) $ in Millions	Dec. 07, 2021 USD ($)
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

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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.

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