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REPURCHASE ARRANGEMENTS AND SIMILAR BORROWINGS - Narrative (Details) (Repurchase Arrangements And Similar Borrowings [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Repurchase Arrangements And Similar Borrowings [Member]
     
Repurchase Arrangements And Similar Borrowings, Including Interest Rate Hedging Activity [Line Items]      
Interest paid on Repurchase arrangements and similar borrowings $ 59.7us-gaap_InterestPaid
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cmo_RepurchaseArrangementsAndSimilarBorrowingsMemberRepurchaseArrangementsAndSimilarBorrowingsMember
$ 71.1us-gaap_InterestPaid
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cmo_RepurchaseArrangementsAndSimilarBorrowingsMemberRepurchaseArrangementsAndSimilarBorrowingsMember
$ 69.5us-gaap_InterestPaid
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cmo_RepurchaseArrangementsAndSimilarBorrowingsMemberRepurchaseArrangementsAndSimilarBorrowingsMember