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v3.21.1

Multi-family Loans, at Fair Value - Unpaid Principal Balance (Details) - 90 Days or greater past due - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Fair Value | $ 3,481 | $ 3,325
Unpaid Principal Balance | $ 3,363 | $ 3,363

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- Definition Equity And Mezzanine Loans, Principal Amount Of Delinquent Loans + References 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 Equity and Mezzanine Loans, Fair Value + References No definition available. + Details
Name: | nymt_EquityandMezzanineLoansFairValue
Namespace Prefix: | nymt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |