| Document and Entity Information | Feb. 03, 2020 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001437071 |
| Document Type | 8-K |
| Document Period End Date | Feb. 3, 2020 |
| Entity Registrant Name | Invesco Mortgage Capital Inc. |
| Entity Incorporation State Country Code | MD |
| Entity File Number | 001-34385 |
| Entity Tax Identification Number | 26-2749336 |
| Entity Address, Address Line One | 1555 Peachtree Street |
| Entity Address, Address Line Two | NE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | IVR |
| Security Exchange Name | NYSE |
| Series A Cumulative Redeemable Preferred Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 7.75% Series A Cumulative Redeemable Preferred Stock |
| Trading Symbol | IVRpA |
| Security Exchange Name | NYSE |
| Series B Cumulative Redeemable Preferred Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 7.75% Fixed-to-Floating Series B Cumulative Redeemable Preferred Stock |
| Trading Symbol | IVRpB |
| Security Exchange Name | NYSE |
| Series C Cumulative Redeemable Preferred Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 7.50% Fixed-to-Floating Series C Cumulative Redeemable Preferred Stock |
| Trading Symbol | IVRpC |
| Security Exchange Name | NYSE |
