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Income Taxes - REIT Activities (Details)	Dec. 31, 2014 USD ($)
Income Tax Disclosure [Abstract]
Undistributed REIT taxable income	$ 400,000

X

- Definition

Undistribute REIT taxable income

+ References

No definition available.

+ Details

Name:	orc_UndistributedIncome
Namespace Prefix:	orc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration