2.2.0.25falsefalse0201 - Disclosure - Organizationtruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $ThreeMonthsEnded_31March2011http://www.sec.gov/CIK0000921847duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0hcbk_OrganizationAbstracthcbkfalsenadurationOrganization.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringOrganization.falsefalseOrganization [Abstract]3false0us-gaap_NatureOfOperationsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00   <div align="left" style="font-family: 'Times New Roman',Times,serif">   <div align="center" style="font-size: 10pt; margin-top: 0pt"><i></i> </div> <div align="left" style="font-size: 10pt; margin-top: 12pt"><b>1. Organization</b> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">Hudson City Bancorp, Inc. (“Hudson City Bancorp” or the “Company”) is a Delaware corporation and is the savings and loan holding company for Hudson City Savings Bank and its subsidiaries (“Hudson City Savings” or the “Bank”). Each of Hudson City Savings and the Company is currently subject to the regulation and examination of the Office of Thrift Supervision (“OTS”). </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">On July 21, 2010, President Obama signed the Dodd-Frank Wall Street Reform and Consumer Protection Act (the ‘Reform Act”). The Reform Act, among other things, effectively merges the OTS into the Office of the Comptroller of the Currency (“OCC”), with the OCC assuming all functions and authority from the OTS relating to federally chartered savings banks, and the Federal Reserve Board (the “FRB”) assuming all functions and authority from the OTS relating to savings and loan holding companies. Pursuant to the Reform Act, the OTS will be merged into the OCC as early as July 2011 at which time Hudson City Savings will be regulated by the OCC and the Company will be regulated by the FRB. </div> </div>  <!-- Begin Block Tagged NotefalsefalsefalsefalsefalseOtherus-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