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Derivative Instruments and Hedging Activities - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading - Interest rate swaps - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | $ 495,500 | $ 345,500
Additions | 0 | 50,000
Settlement, Expiration or Exercise | 0 | 0
Ending balance | $ 495,500 | $ 395,500

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- Definition Derivative Asset (Liability), Notional Amount + 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 Derivative Instruments and Hedging Activities Disclosures [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | nymt_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Additions for notional amount of other derivatives.. + References No definition available. + Details
Name: | nymt_NotionalAmountOfOtherDerivativeAdditions
Namespace Prefix: | nymt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Settlement, expiration, or exercise for notional amount of other derivatives. + References No definition available. + Details
Name: | nymt_NotionalAmountOfOtherDerivativesSettlementExpirationOrExercise
Namespace Prefix: | nymt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NotDesignatedAsHedgingInstrumentTradingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |