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CMO Capstead Mortgage

Document and Entity Information

Document and Entity InformationApr. 28, 2021
Document and Entity Information [Line Items]
Document Type8-K
Amendment Flagfalse
Document Period End DateApr. 28,
2021
Entity Registrant NameCAPSTEAD MORTGAGE CORPORATION
Entity Central Index Key0000766701
Entity Emerging Growth Companyfalse
Entity File Number001-08896
Entity Incorporation, State or Country CodeMD
Entity Tax Identification Number75-2027937
Entity Address, Address Line One8401 North Central Expressway
Entity Address, Address Line TwoSuite 800
Entity Address, City or TownDallas
Entity Address, State or ProvinceTX
Entity Address, Postal Zip Code75225
City Area Code214
Local Phone Number874-2323
Written Communicationsfalse
Soliciting Materialfalse
Pre Commencement Tender Offerfalse
Pre Commencement Issuer Tender Offerfalse
Common Stock [Member]
Document and Entity Information [Line Items]
Security 12b TitleCommon Stock ($0.01 par value)
Trading SymbolsCMO
Security Exchange NameNYSE
Series E Preferred Stock [Member]
Document and Entity Information [Line Items]
Security 12b Title7.50% Series E Cumulative Redeemable    
   Preferred Stock ($0.10 par value)
Trading SymbolsCMOPRE
Security Exchange NameNYSE