v3.3.1.900
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Mar. 04, 2016
Jun. 30, 2014
Document and Entity Information      
Entity Registrant Name IMPAC MORTGAGE HOLDINGS INC    
Entity Central Index Key 0001000298    
Document Type 10-K    
Document Period End Date Dec. 31, 2015    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 143.5
Entity Common Stock, Shares Outstanding   12,178,250  
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY