DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Registrant Name	Orchid Island Capital, Inc.
Entity Central Index Key	0001518621
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
EntityExTransitionPeriod	false
Entity Shell Company	false
Entity Public Float			$ 378,490,103
Entity Common Stock Shares Outstanding		48,662,448
Trading Symbol	ORC
Entity Well Known Seasoned Issuer	No
Entity Voluntary Filers	No