Cover - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-34385
Entity Registrant Name	Invesco Mortgage Capital Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	26-2749336
Entity Address, Address Line One	1555 Peachtree Street, N.E., Suite 1800
Entity Address, City or Town	Atlanta,
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30309
City Area Code	404
Local Phone Number	892-0896
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 678,164,356
Entity Common Stock, Shares Outstanding		230,822,108
Documents Incorporated by Reference	Part III of this Form 10-K incorporates by reference certain information (solely to the extent explicitly indicated) from the registrant’s proxy statement for the 2021 Annual Meeting of Stockholders to be filed pursuant to Regulation 14A.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0001437071
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	IVR
Security Exchange Name	NYSE
7.75% Series A Cumulative Redeemable Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	7.75% Series A Cumulative Redeemable Preferred Stock
Trading Symbol	IVRpA
Security Exchange Name	NYSE
7.75% Fixed-to-Floating Series B Cumulative Redeemable Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	7.75% Fixed-to-Floating Series B Cumulative Redeemable Preferred Stock
Trading Symbol	IVRpB
Security Exchange Name	NYSE
7.50% Fixed-to-Floating Series C Cumulative Redeemable Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	7.50% Fixed-to-Floating Series C Cumulative Redeemable Preferred Stock
Trading Symbol	IVRpC
Security Exchange Name	NYSE