Cover Page Document - USD ($)	12 Months Ended
	Dec. 31, 2022	Mar. 03, 2023	Jun. 30, 2022
Cover [Abstract]
Title of 12(b) Security	Common Shares of Beneficial Interest, $0.01 par value per share
Entity Incorporation, State or Country Code	MD
Document Transition Report	false
Document Annual Report	true
Entity Registrant Name	Ellington Residential Mortgage REIT
Entity Address, Address Line One	53 Forest Avenue
Entity Address, City or Town	Old Greenwich
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06870
Entity Central Index Key	0001560672
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Document Type	10-K
Document Period End Date	Dec. 31, 2022
Entity File Number	001-35896
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		13,781,492
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Shell Company	false
Entity Public Float			$ 95,014,740
Entity Tax Identification Number	46-0687599
City Area Code	203
Local Phone Number	698-1200
Trading Symbol	EARN
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Icfr Auditor Attestation Flag	false
Entity Current Reporting Status	Yes