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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Schedule of Assets and Liabilities of Consolidated VIEs (Details) - VIE, Primary Beneficiary $ in Thousands	Jun. 30, 2024 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Residential loans, at fair value	$ 285,057
Collateralized debt obligations, at fair value	(275,200)
Net investment	$ 9,857

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- Definition

Financial Instruments Owned, Residential Loans At Fair Value

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No definition available.

+ Details

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Namespace Prefix:	nymt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Fair value of secured debt.

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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

X

- Definition

Variable Interest Entity, Primary Beneficiary, Maximum Loss (Gain) Exposure, Amount

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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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- 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.

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No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Period Type: