Orchid Island Capital is a real estate investment trust. Co. invests in residential mortgage-backed securities (RMBS). The principal and interest payments of these RMBS are guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association and are backed primarily by single-family residential mortgage loans. Co.'s portfolio consists of two categories of Agency RMBS: pass-through Agency RMBS, such as mortgage pass through certificates and collateralized mortgage obligations; and structured Agency RMBS, such as interest only securities, inverse interest only securities and principal only securities.