2.2.0.25falsefalse0201 - Disclosure - Organizationtruefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 3/31/2010 USD ($) USD ($) / shares $FROM_Jan01_2010_TO_Mar31_2010http://www.sec.gov/CIK0001241199duration2010-01-01T00:00:002010-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0EPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0us-gaap_GeneralPoliciesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseOrganization [Abstract]3false0us-gaap_NatureOfOperationsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00Note 1.  Organization References to we, us, the Company or CapitalSource refer to CapitalSource Inc., a Delaware corporation, together with its subsidiaries. References to CapitalSource Bank include its subsidiaries, and references to Parent Company refer to CapitalSource Inc. and its subsidiaries other than CapitalSource Bank. We are a commercial lender that, primarily through our wholly owned subsidiary, CapitalSource Bank, provides financial products to small and middle market businesses nationwide and provides depository products and services in southern and central California.  For the three months ended March 31, 2011, we operated as two reportable segments: 1) CapitalSource Bank and 2) Other Commercial Finance. For the three months ended March 31, 2010, we operated as three reportable segments: 1) CapitalSource Bank, 2) Other Commercial Finance, and 3) Healthcare Net Lease. Our CapitalSource Bank segment comprises our commercial lending and banking business activities, and our Other Commercial Finance segment comprises our loan portfolio and other business activities in the Parent Company. Our Healthcare Net Lease segment comprised our direct real estate investment business activities, which we exited completely with the sale of all of the assets related to this segment during 2010, and consequently, we have presented the financial condition and results of operations within our Healthcare Net Lease segment as discontinued operations for all periods presented. We have reclassified all comparative period results to reflect our two current reportable segments. For additional information, see Note 19, Segment Data. Note 1.  Organization References to we, us, the Company or CapitalSource refer to CapitalSource Inc., a Delaware corporation, together withfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescribes the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings). Disclosures about the nature of operations need not be quantified; relative importance could be conveyed by use of terms such as "predominately", "about equally", or "major and other". This element is also referred to as "Business Description".Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 10 falsefalseOrganization12OrganizationUnKnownUnKnownUnKnownUnKnownfalsetrue