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Unsecured Borrowings (Narrative) (Details) (USD $)
9 Months Ended9 Months Ended9 Months Ended12 Months Ended9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Mar. 31, 2008
Sep. 30, 2011
Maximum [Member]
Sep. 30, 2011
Minimum [Member]
Sep. 30, 2011
Capstead Mortgage Trust I [Member]
Sep. 30, 2011
Capstead Mortgage Trust II [Member]
Sep. 30, 2011
Capstead Mortgage Trust III [Member]
Dec. 31, 2010
Junior Subordinated Notes [Member]
Sep. 30, 2011
For Initial Ten Years [Member]
Dec. 31, 2010
For Final Twenty Years [Member]
Sep. 30, 2011
Special-purpose Statutory Trusts [Member]
Debt Instrument [Line Items]            
Junior subordinated notes maturity term (years)30           
Issuance of common securities           $ 3,100,000
Proceeds from private placement of preferred securities           100,000,000
Remaining issue costs2,400,000           
Junior subordinated notes interest rate, minimum         8.19%  
Junior subordinated notes interest rate, maximum         8.685%  
Interest rate spread over three-month LIBOR   3.50%3.30%       
Junior subordinated notes, maturity period     October 2035December 2035September 2036    
Junior subordinated notes, earliest redemption option exercise dateOct. 30, 2010Dec. 15, 2015Sep. 15, 2016
Notional amount of swap agreement  $ 100,000,000     $ 100,000,000   
Effective borrowing rate considering cash-flow hedges          7.56% 
Average fixed rates of interest rate swap agreements 4.09%          
Term of interest rate swap agreement (in years) 20