Cover - shares	9 Months Ended
	Sep. 30, 2019	Nov. 07, 2019
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-32216
Entity Registrant Name	NEW YORK MORTGAGE TRUST, INC.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	47-0934168
Entity Address, Address Line One	90 Park Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10016
City Area Code	212
Local Phone Number	792-0107
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		262,621,039
Amendment Flag	false
Entity Central Index Key	0001273685
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	NYMT
Security Exchange Name	NASDAQ
7.75% Series B Cumulative Redeemable Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	7.75% Series B Cumulative Redeemable Preferred Stock, par value $0.01 per share, $25.00 Liquidation Preference
Trading Symbol	NYMTP
Security Exchange Name	NASDAQ
7.875% Series C Cumulative Redeemable Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	7.875% Series C Cumulative Redeemable Preferred Stock, par value $0.01 per share, $25.00 Liquidation Preference
Trading Symbol	NYMTO
Security Exchange Name	NASDAQ
8.000% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	8.000% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, par value $0.01 per share, $25.00 Liquidation Preference
Trading Symbol	NYMTN
Security Exchange Name	NASDAQ
7.875% Series E Fixed-to-Floating Rate Cumulative Redeemable, Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	7.875% Series E Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, par value $0.01 per share, $25.00 Liquidation Preference
Trading Symbol	NYMTM
Security Exchange Name	NASDAQ