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Loans secured by one to four-family residential property of the borrower are generally referred to as residential mortgage loans. Repayment terms for residential mortgage loans may vary considerably. Such loans may be structured to provide for full amortization of principal, partial amortization with a balloon payment at a specified date, or negative amortization. Interest rates may be fixed or variable. This item excludes subordinated loans such as home equity lines of credit.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 40, 41 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph c(i) -Subsection I truefalseTotal loans7false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://hcsbonline.com/role/loansandallowanceforloanlossesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : One- to four-family, Amortizing [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_One_To_Four_Family_Amortizing_Memberhttp://www.sec.gov/CIK0000921847instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOne- to four-family, Amortizing [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldihcbk_OneToFourFamilyAmortizingMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : One- to four-family, Amortizing [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_One_To_Four_Family_Amortizing_Memberhttp://www.sec.gov/CIK0000921847instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOne- to four-family, Amortizing [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldihcbk_OneToFourFamilyAmortizingMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseOne- to four-family, Amortizing [Member]8true0hcbk_FirstMortgageLoansAbstracthcbkfalsenadurationFirst mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFirst mortgage loans.falsefalseFirst mortgage loans:9false0hcbk_TotalFirstMortgageLoanshcbkfalsedebitinstantTotal first mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse2433062400024330624falsefalsefalsefalsefalse2truefalsefalse2491293500024912935falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal first mortgage loans.No authoritative reference available.truefalseTotal first mortgage loans10true0hcbk_ConsumerAndOtherLoansAbstracthcbkfalsenadurationConsumer and other loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringConsumer and other loans.falsefalseConsumer and other loans:11false0us-gaap_LoansAndLeasesReceivableConsumerMortgageus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse2493884000024938840falsefalsefalsefalsefalse2truefalsefalse2541265900025412659falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the gross carrying amount of unpaid loans issued to individuals to acquire or improve land or a building or to provide cash to the borrower, and which are secured by the acquired or improved realty. Loans secured by one to four-family residential property of the borrower are generally referred to as residential mortgage loans. Repayment terms for residential mortgage loans may vary considerably. Such loans may be structured to provide for full amortization of principal, partial amortization with a balloon payment at a specified date, or negative amortization. Interest rates may be fixed or variable. This item excludes subordinated loans such as home equity lines of credit.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 40, 41 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph c(i) -Subsection I truefalseTotal loans12false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://hcsbonline.com/role/loansandallowanceforloanlossesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse5falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : One- to four-family, Interest-only [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_One_To_Four_Family_Interest_Only_Memberhttp://www.sec.gov/CIK0000921847instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseOne- to four-family, Interest-only [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldihcbk_OneToFourFamilyInterestOnlyMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : One- to four-family, Interest-only [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_One_To_Four_Family_Interest_Only_Memberhttp://www.sec.gov/CIK0000921847instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseOne- to four-family, Interest-only [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldihcbk_OneToFourFamilyInterestOnlyMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseOne- to four-family, Interest-only [Member]13true0hcbk_FirstMortgageLoansAbstracthcbkfalsenadurationFirst mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFirst mortgage loans.falsefalseFirst mortgage loans:14false0hcbk_TotalFirstMortgageLoanshcbkfalsedebitinstantTotal first mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse50528550005052855falsefalsefalsefalsefalse2truefalsefalse51364630005136463falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal first mortgage loans.No authoritative reference available.truefalseTotal first mortgage loans15true0hcbk_ConsumerAndOtherLoansAbstracthcbkfalsenadurationConsumer and other loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringConsumer and other loans.falsefalseConsumer and other loans:16false0us-gaap_LoansAndLeasesReceivableConsumerMortgageus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse50528550005052855falsefalsefalsefalsefalse2truefalsefalse51364630005136463falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the gross carrying amount of unpaid loans issued to individuals to acquire or improve land or a building or to provide cash to the borrower, and which are secured by the acquired or improved realty. Loans secured by one to four-family residential property of the borrower are generally referred to as residential mortgage loans. Repayment terms for residential mortgage loans may vary considerably. Such loans may be structured to provide for full amortization of principal, partial amortization with a balloon payment at a specified date, or negative amortization. Interest rates may be fixed or variable. This item excludes subordinated loans such as home equity lines of credit.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 40, 41 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph c(i) -Subsection I truefalseTotal loans17false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://hcsbonline.com/role/loansandallowanceforloanlossesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : FHA/VA [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Federal_Housing_Administration_Loan_Memberhttp://www.sec.gov/CIK0000921847instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFHA/VA [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FederalHousingAdministrationLoanMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : FHA/VA [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Federal_Housing_Administration_Loan_Memberhttp://www.sec.gov/CIK0000921847instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFHA/VA [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FederalHousingAdministrationLoanMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFHA/VA [Member]18true0hcbk_FirstMortgageLoansAbstracthcbkfalsenadurationFirst mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFirst mortgage loans.falsefalseFirst mortgage loans:19false0hcbk_TotalFirstMortgageLoanshcbkfalsedebitinstantTotal first mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse608216000608216falsefalsefalsefalsefalse2truefalsefalse499724000499724falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal first mortgage loans.No authoritative reference available.truefalseTotal first mortgage loans21false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://hcsbonline.com/role/loansandallowanceforloanlossesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse9falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : Multi Family And Commercial [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Multi_Family_And_Commercial_Memberhttp://www.sec.gov/CIK0000921847instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseMulti-family and commercial mortgages [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldihcbk_MultiFamilyAndCommercialMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : Multi Family And Commercial [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Multi_Family_And_Commercial_Memberhttp://www.sec.gov/CIK0000921847instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseMulti-family and commercial mortgages [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldihcbk_MultiFamilyAndCommercialMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseMulti-family and commercial mortgages [Member]22true0hcbk_FirstMortgageLoansAbstracthcbkfalsenadurationFirst mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFirst mortgage loans.falsefalseFirst mortgage loans:23false0hcbk_TotalFirstMortgageLoanshcbkfalsedebitinstantTotal first mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse4446600044466falsefalsefalsefalsefalse2truefalsefalse4806700048067falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal first mortgage loans.No authoritative reference available.truefalseTotal first mortgage loans24true0hcbk_ConsumerAndOtherLoansAbstracthcbkfalsenadurationConsumer and other loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringConsumer and other loans.falsefalseConsumer and other loans:25false0us-gaap_LoansAndLeasesReceivableConsumerMortgageus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse4446600044466falsefalsefalsefalsefalse2truefalsefalse4806700048067falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the gross carrying amount of unpaid loans issued to individuals to acquire or improve land or a building or to provide cash to the borrower, and which are secured by the acquired or improved realty. Loans secured by one to four-family residential property of the borrower are generally referred to as residential mortgage loans. Repayment terms for residential mortgage loans may vary considerably. Such loans may be structured to provide for full amortization of principal, partial amortization with a balloon payment at a specified date, or negative amortization. Interest rates may be fixed or variable. This item excludes subordinated loans such as home equity lines of credit.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 40, 41 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph c(i) -Subsection I truefalseTotal loans26false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://hcsbonline.com/role/loansandallowanceforloanlossesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse11falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : Construction [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Construction_Loans_Memberhttp://www.sec.gov/CIK0000921847instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseConstruction [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ConstructionLoansMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : Construction [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Construction_Loans_Memberhttp://www.sec.gov/CIK0000921847instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseConstruction [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ConstructionLoansMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseConstruction [Member]27true0hcbk_FirstMortgageLoansAbstracthcbkfalsenadurationFirst mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFirst mortgage loans.falsefalseFirst mortgage loans:28false0hcbk_TotalFirstMortgageLoanshcbkfalsedebitinstantTotal first mortgage loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse85950008595falsefalsefalsefalsefalse2truefalsefalse90810009081falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal first mortgage loans.No authoritative reference available.truefalseTotal first mortgage loans29true0hcbk_ConsumerAndOtherLoansAbstracthcbkfalsenadurationConsumer and other loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringConsumer and other loans.falsefalseConsumer and other loans:30false0us-gaap_LoansAndLeasesReceivableConsumerMortgageus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse85950008595falsefalsefalsefalsefalse2truefalsefalse90810009081falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the gross carrying amount of unpaid loans issued to individuals to acquire or improve land or a building or to provide cash to the borrower, and which are secured by the acquired or improved realty. Loans secured by one to four-family residential property of the borrower are generally referred to as residential mortgage loans. Repayment terms for residential mortgage loans may vary considerably. Such loans may be structured to provide for full amortization of principal, partial amortization with a balloon payment at a specified date, or negative amortization. Interest rates may be fixed or variable. This item excludes subordinated loans such as home equity lines of credit.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 40, 41 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph c(i) -Subsection I truefalseTotal loans31false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://hcsbonline.com/role/loansandallowanceforloanlossesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse13falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : Fixed-rate second mortgages [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Fixed_Rate_Second_Mortgages_Memberhttp://www.sec.gov/CIK0000921847instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseFixed-rate second mortgages [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldihcbk_FixedRateSecondMortgagesMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$14falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : Fixed-rate second mortgages [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Fixed_Rate_Second_Mortgages_Memberhttp://www.sec.gov/CIK0000921847instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseFixed-rate second mortgages [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldihcbk_FixedRateSecondMortgagesMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFixed-rate second mortgages [Member]33true0hcbk_ConsumerAndOtherLoansAbstracthcbkfalsenadurationConsumer and other loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringConsumer and other loans.falsefalseConsumer and other loans:34false0hcbk_TotalConsumerAndOtherLoanshcbkfalsedebitinstantTotal consumer and other loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse150705000150705falsefalsefalsefalsefalse2truefalsefalse160896000160896falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal consumer and other loans.No authoritative reference available.truefalseTotal consumer and other loans35false0us-gaap_LoansAndLeasesReceivableConsumerMortgageus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse150705000150705falsefalsefalsefalsefalse2truefalsefalse160896000160896falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the gross carrying amount of unpaid loans issued to individuals to acquire or improve land or a building or to provide cash to the borrower, and which are secured by the acquired or improved realty. 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This item excludes subordinated loans such as home equity lines of credit.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 40, 41 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph c(i) -Subsection I truefalseTotal loans36false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://hcsbonline.com/role/loansandallowanceforloanlossesdetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse15falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : Home equity credit lines [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_Home_Equity_Memberhttp://www.sec.gov/CIK0000921847instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseHome equity credit lines [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_HomeEquityMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$16falsefalseUSDtruefalse{us-gaap_MortgageLoansOnRealEstateLoanTypeAxis} : Home equity credit lines [Member] 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Home_Equity_Memberhttp://www.sec.gov/CIK0000921847instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseHome equity credit lines [Member]us-gaap_MortgageLoansOnRealEstateLoanTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_HomeEquityMemberus-gaap_MortgageLoansOnRealEstateLoanTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseHome equity credit lines [Member]38true0hcbk_ConsumerAndOtherLoansAbstracthcbkfalsenadurationConsumer and other loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringConsumer and other loans.falsefalseConsumer and other loans:39false0hcbk_TotalConsumerAndOtherLoanshcbkfalsedebitinstantTotal consumer and other loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse136248000136248falsefalsefalsefalsefalse2truefalsefalse137467000137467falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal consumer and other loans.No authoritative reference available.truefalseTotal consumer and other loans40false0us-gaap_LoansAndLeasesReceivableConsumerMortgageus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse136248000136248falsefalsefalsefalsefalse2truefalsefalse137467000137467falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the gross carrying amount of unpaid loans issued to individuals to acquire or improve land or a building or to provide cash to the borrower, and which are secured by the acquired or improved realty. 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This item excludes subordinated loans such as home equity lines of credit.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 40, 41 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph c(i) -Subsection I truefalseTotal loans240Loans and Allowance for Loan Losses (Details) (USD $)ThousandsUnKnownUnKnownUnKnownfalsetrue