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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2018
Feb. 01, 2019
Jun. 30, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name NEW YORK MORTGAGE TRUST INC    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   170,241,340  
Entity Public Float     $ 740,252,950
Amendment Flag false    
Entity Central Index Key 0001273685    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY