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Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2024 USD ($)
Maximum
Other Commitments [Line Items]
Commitments to fund advances for business purpose loans	$ 222.4

X

- Definition

Unrecorded Commitment To Fund Advances On Business Purpose Loans

+ References

No definition available.

+ Details

Name:	nymt_UnrecordedCommitmentToFundAdvancesOnBusinessPurposeLoans
Namespace Prefix:	nymt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

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

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: