No definition available.

Name:	hcbk_AllowanceForLoanLossesChargeOffs
Namespace Prefix:	hcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Allowance for loan losses net charges offs.

No definition available.

Name:	hcbk_AllowanceForLoanLossesNetChargesOffs
Namespace Prefix:	hcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Allowance for loan losses recoveries.

No definition available.

Name:	hcbk_AllowanceForLoanLossesRecoveries
Namespace Prefix:	hcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Financing receivable allowance for credit losses collectively evaluated for impairment.

No definition available.

Name:	hcbk_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix:	hcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

No definition available.

Name:	hcbk_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment
Namespace Prefix:	hcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The balance of financing receivables that were collectively evaluated for impairment.

No definition available.

Name:	hcbk_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix:	hcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The balance of financing receivables that were individually evaluated for impairment.

No definition available.

Name:	hcbk_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix:	hcbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	hcbk_LoanPortfolioAbstract
Namespace Prefix:	hcbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Subsection I

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

Name:	us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Chapter 5

-Paragraph 168, 169, 170

-IssueDate 2006-05-01

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9