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

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- Definition Number of counterparties the entity has repurchase agreements with. + References No definition available. + Details
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Namespace Prefix: | nymt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Repurchase Agreements, Number Of Financial Institutions + References No definition available. + Details
Name: | nymt_RepurchaseAgreementsNumberOfFinancialInstitutions
Namespace Prefix: | nymt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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