2.2.0.7 false Basis of Presentation 0202 - Disclosure - Basis of Presentation true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Basis of Presentation [Abstract] 0 us-gaap_GeneralPoliciesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Basis of Presentation 1 us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0   <div style="font-family: 'Times New Roman',Times,serif"> <div align="left" style="font-size: 10pt; margin-top: 12pt"><b>2. Basis of Presentation</b> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">The accompanying consolidated financial statements include the accounts of Hudson City Bancorp and its wholly-owned subsidiary, Hudson City Savings. </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">In our opinion, all the adjustments (consisting of normal and recurring adjustments) necessary for a fair presentation of the consolidated financial condition and consolidated results of operations for the unaudited periods presented have been included. The results of operations and other data presented for the three and nine month periods ended September 30, 2010 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2010. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the statements of financial condition and the results of operations for the period. Actual results could differ from these estimates. The allowance for loan losses (“ALL”) is a material estimate that is particularly susceptible to near-term change. The current economic environment has increased the degree of uncertainty inherent in this material estimate. </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">Certain information and note disclosures usually included in financial statements prepared in accordance with U.S. generally accepted accounting principles have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for the preparation of the Form 10-Q. The consolidated financial statements presented should be read in conjunction with Hudson City Bancorp’s audited consolidated financial statements and notes to consolidated financial statements included in Hudson City Bancorp’s 2009 Annual Report to Shareholders and incorporated by reference into Hudson City Bancorp’s 2009 Annual Report on Form 10-K. </div>   </div>  <div style="font-family: 'Times New Roman',Times,serif"> </div>  <!-- Begin Block Tagged Note false false false us-types:textBlockItemType textblock Description containing the entire organization, consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph 8, C1, C7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 2-6 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 10 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 4, 14, 15 false 1 2 false UnKnown UnKnown UnKnown false true