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Repurchase Agreements - Narrative (Details)	Sep. 30, 2021 financialInstitution counterparty
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Repurchase agreements, number of financial institutions | financialInstitution	3
Repurchase agreements, number of counterparties | counterparty	2

X

- Definition

Number of counterparties the entity has repurchase agreements with.

+ References

No definition available.

+ Details

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X

- Definition

Repurchase Agreements, Number Of Financial Institutions

+ References

No definition available.

+ Details

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Namespace Prefix:	nymt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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