| DOCUMENT AND ENTITY INFORMATION | Mar. 17, 2021 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 17, 2021 |
| Entity Registrant Name | Orchid Island Capital, Inc. |
| Entity Central Index Key | 0001518621 |
| Entity Emerging Growth Company | false |
| Trading Symbol | ORC |
| Security Exchange Name | NYSE |
| Security 12(b) Title | Common Stock, par value $0.01 per share |
| City Area Code | 772 |
| Local Phone Number | 231-1400 |
| Entity Address Line 1 | 3305 Flamingo Drive |
| Entity Address City or Town | Vero Beach |
| Entity Address State or Province | FL |
| Entity Postal Zip Code | 32963 |
| Entity Incorporation, State Country Name | MD |
| Entity File Number | 001-35236 |
| Entity Tax ID Number | 27-3269228 |
| PreCommencementIssuerTenderOffer | false |
| PreCommencementTenderOffer | false |
| SolicitingMaterial | false |
| WrittenCommunications | false |
