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DOCUMENT AND ENTITY INFORMATION - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 25, 2022
Jun. 30, 2021
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
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    
Entity Shell Company false    
Entity Common Stock Shares Outstanding   176,993,049  
Trading Symbol ORC    
Security Exchange Name NYSE    
Security 12(b) Title Common Stock, $0.01 par value    
Interactive Data Current Yes    
Document Transition Report false    
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    
DocumentAnnualReport true    
Entity Well Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 595,104,430
DocumentsIncorporatedByReferenceTextBlock
Portions of the Registrant's
 
definitive Proxy Statement, to be
 
issued in connection with
 
the 2022 Annual Meeting
 
of Stockholders
of the Registrant, are incorporated by reference
 
into Part III of this Annual Report on Form 10-K (this “Report”).
    
Auditor Name BDO USA, LLP    
Auditor Firm Id 243    
Auditor Location West Palm Beach, FL    
ICFR true