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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	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Roll Forward]
Beginning balance	$ 495,500	$ 345,500
Additions	0	0
Settlement, Expiration or Exercise	0	0
Ending balance	$ 495,500	$ 345,500

X

- 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

X

- Definition

Derivative Instruments and Hedging Activities Disclosures [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	nymt_
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Balance Type:	na
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X

- Definition

Additions for notional amount of other derivatives..

+ References

No definition available.

+ Details

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

X

- 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
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X

- Details

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

X

- Details

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