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Document And Entity Information - shares
 3 Months Ended
Mar. 31, 2019
May 07, 2019
Document and Entity Information [Abstract]    
Entity Registrant Name NEW YORK MORTGAGE TRUST INC  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   190,091,655
Amendment Flag false  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Central Index Key 0001273685  
Entity Filer Category Large Accelerated Filer  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1