2.2.0.25falsefalse06094 - Disclosure - Borrowed Funds (Details Textual)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) / shares USD ($) $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000921847duration2010-01-01T00:00:002010-12-31T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3true0hcbk_BorrowedFundsTextualsAbstracthcbkfalsenadurationBorrowed Funds.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringBorrowed Funds.falsefalseBorrowed Funds (Textuals) [Abstract]4false0hcbk_CollateralizedBorrowingsSecuritiesSoldUnderAgreementsToRepurchaseToLiquidatingCompanyhcbkfalsecreditinstantCollateralized Borrowings Securities Sold Under Agreements To Repurchase To Liquidating Company.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse100000000100.0falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCollateralized Borrowings Securities Sold Under Agreements To Repurchase To Liquidating Company.No authoritative reference available.falsefalseTotal collateral borrowings in the form of repurchase agreements with Lehman Brothers, Inc.5false0hcbk_NumberOfCollateralBorrowingsInFormOfRepurchaseAgreementsWithLiquidatingCompanyhcbkfalsenadurationNumber of collateral borrowings in form of repurchase agreements with Liquidating Company.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse22falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerNumber of collateral borrowings in form of repurchase agreements with Liquidating Company.No authoritative reference available.falsefalseNumber of collateral borrowings in the form of repurchase agreements with Lehman Brothers, Inc.6false0hcbk_AmortizedCostOfSecuritiesSoldUnderAgreementsToRepurchaseToLiquidatingCompanyhcbkfalsedebitinstantAmortized Cost Of Securities Sold Under Agreements To Repurchase To Liquidating Company.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse114500000114.5falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmortized Cost Of Securities Sold Under Agreements To Repurchase To Liquidating Company.No authoritative reference available.falsefalseAmortized cost of mortgage-backed securities pledged as collateral for borrowings with Lehman Brothers, Inc.7false0hcbk_RepurchasePriceOfPledgedCollateralHeldByLiquidatingCompanyhcbkfalsedebitinstantRepurchase price of pledged collateral held by Liquidating Company.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse100000000100falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRepurchase price of pledged collateral held by Liquidating Company.No authoritative reference available.falsefalseRepurchase price of pledged collateral held by Lehman Brothers, Inc.8false0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacityus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse500000000500.0falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 falsefalseMaximum amount of unused lines of credit available from the FHLB, other than repurchase agreements9false0us-gaap_LineOfCreditFacilityCollateralus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00at least equal to 110% of any outstanding advancesat least equal to 110% of any outstanding advancesfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDiscussion of whether the borrowings under the credit facility are secured or unsecured and, if secured, a description of collateral (for example, accounts receivable less than 120 days old, finished goods inventory).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 falsefalseFair value percentage of certain qualifying assets held as collateral under blanket security agreement17Borrowed Funds (Details Textual) (USD $)HundredThousandsUnKnownUnKnownUnKnowntruetrue