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Significant Accounting Policies - Cash and Cash Equivalents (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Cash Held by Broker as Margin on Eurodollar Futures Contracts $ 6,078,000us-gaap_MarginDepositAssets $ 5,174,000us-gaap_MarginDepositAssets
Cash Held on Deposit with Repurchase Agreement Counterparties 2,185,000orc_Repurchaseagreementcashcollateral 2,616,000orc_Repurchaseagreementcashcollateral
Uninsured Cash Balances 78,800,000us-gaap_CashUninsuredAmount  
Insurance per depositor at each financial institution $ 250,000orc_FederalDepositInsuranceCorporationPerDepositorLimit