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Cover
Jun. 22, 2023
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 22, 2023
Current Fiscal Year End Date --10-31
Entity File Number 811-21727
Entity Registrant Name First Trust Mortgage Income Fund
Entity Central Index Key 0001319183
Entity Tax Identification Number 35-6758396
Entity Incorporation, State or Country Code MA
Entity Address, Address Line One 120 East Liberty Drive, Suite 400
Entity Address, City or Town Wheaton
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60187
City Area Code 630
Local Phone Number 765-8000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false