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Federal funds sold represent the excess federal funds held by one commercial bank which it lends to another commercial bank, usually at an agreed-upon (federal funds) rate of interest. Such loans are made for legal reserve requirement purposes of the borrowing bank and generally are of short-duration (overnight). 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 6 -Subsection II Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 6 -Article 9 false 15 Borrowed funds 2 us-gaap_InterestExpenseBorrowings us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 307950000 307950 false false false 2 false true false false 305783000 305783 false false false 3 false true false false 912152000 912152 false false false 4 false true false false 908558000 908558 false false false xbrli:monetaryItemType monetary Aggregate amount of interest expense on all borrowings. 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 -Subsection I true 16 Total interest expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 398476000 398476 false false false 2 false true false false 418708000 418708 false false false 3 false true false false 1202267000 1202267 false false false 4 false true false false 1283561000 1283561 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 9 -Subsection II Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 true 17 Net interest income 1 us-gaap_InterestIncomeExpenseNet us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 290334000 290334 false false false 2 false true false false 325457000 325457 false false false 3 false true false false 938993000 938993 false false false 4 false true false false 911685000 911685 false false false xbrli:monetaryItemType monetary Amount of net interest income or expense derived from banking operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 10 -Article 9 false 18 Provision for Loan Losses 1 us-gaap_ProvisionForLoanLeaseAndOtherLosses us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 50000000 50000 false false false 2 false true false false 40000000 40000 false false false 3 false true false false 150000000 150000 false false false 4 false true false false 92500000 92500 false false false xbrli:monetaryItemType monetary 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 true 19 Net interest income after provision for loan losses 1 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 240334000 240334 false false false 2 false true false false 285457000 285457 false false false 3 false true false false 788993000 788993 false false false 4 false true false false 819185000 819185 false false false xbrli:monetaryItemType monetary Net interest and dividend income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 12 -Article 9 true 20 Non-Interest Income: 1 us-gaap_NoninterestIncomeAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 21 Service charges and other income 2 hcbk_ServiceChargesAndOtherIncome hcbk false credit duration Service charges and other income. false false false false false false false false false false false verboselabel false 1 false true false false 2842000 2842 false false false 2 false true false false 2513000 2513 false false false 3 false true false false 7656000 7656 false false false 4 false true false false 7207000 7207 false false false xbrli:monetaryItemType monetary Service charges and other income. No authoritative reference available. false 22 Gain on securities transactions, net 2 us-gaap_PrincipalTransactionsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 31017000 31017 false false false 2 false false false false 0 0 false false false 3 false true false false 92411000 92411 false false false 4 false true false false 24185000 24185 false false false xbrli:monetaryItemType monetary The caption reflecting the net gain or loss, both realized and unrealized, arising from Principal Trading and Principal Investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 80 -Subparagraph Exhibit 4-8, 12 -IssueDate 2006-05-01 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 9, 51, 57 -IssueDate 2006-05-01 true 23 Total non-interest income 2 us-gaap_NoninterestIncome us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 33859000 33859 false false false 2 false true false false 2513000 2513 false false false 3 false true false false 100067000 100067 false false false 4 false true false false 31392000 31392 false false false xbrli:monetaryItemType monetary The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 13 -Subsection II Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 true 24 Non-Interest Expense: 1 us-gaap_NoninterestExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 25 Compensation and employee benefits 2 us-gaap_LaborAndRelatedExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 32054000 32054 false false false 2 false true false false 34043000 34043 false false false 3 false true false false 99005000 99005 false false false 4 false true false false 103166000 103166 false false false xbrli:monetaryItemType monetary The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including share-based compensation, and pension and other postretirement benefit expense. 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No authoritative reference available. false 28 FDIC special assessment 2 hcbk_FdicSpecialAssessment hcbk false debit duration FDIC special assessment. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false true false false 21098000 21098 false false false xbrli:monetaryItemType monetary FDIC special assessment. No authoritative reference available. false 29 Other expense 2 us-gaap_OtherNoninterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 10377000 10377 false false false 2 false true false false 9982000 9982 false false false 3 false true false false 32355000 32355 false false false 4 false true false false 30843000 30843 false false false xbrli:monetaryItemType monetary Other noninterest expenses that are not separately presented in any other noninterest expense category. 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If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 true 35 Diluted earnings per share 1 us-gaap_EarningsPerShareDiluted us-gaap true na duration No definition available. false false false false false false false false false false false totallabel true 1 true true false false 0.25 0.25 false false false 2 true true false false 0.27 0.27 false false false 3 true true false false 0.84 0.84 false false false 4 true true false false 0.8 0.8 false false false us-types:perShareItemType decimal The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period. 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