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Cover
Oct. 18, 2023
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 18, 2023
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
Entity Address, Address Line Two 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
Title of 12(b) Security Common stock, $0.01 par value per share
Trading Symbol FMY
Security Exchange Name NYSE
Entity Emerging Growth Company false