Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

v2.4.1.9
Income Taxes (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current Tax Provision Benefit [Line Items]                        
Federal current tax provision                 $ 186,436,000us-gaap_CurrentFederalTaxExpenseBenefit $ 117,174,000us-gaap_CurrentFederalTaxExpenseBenefit $ 35,387,000us-gaap_CurrentFederalTaxExpenseBenefit  
State current tax provision                 (1,017,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 4,278,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 6,966,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit  
Total current tax provision (benefit)                 185,419,000us-gaap_CurrentIncomeTaxExpenseBenefit 121,452,000us-gaap_CurrentIncomeTaxExpenseBenefit 42,353,000us-gaap_CurrentIncomeTaxExpenseBenefit  
Deferred Tax Provision Benefit [Line Items]                        
Federal deferred tax provision                 41,167,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 112,681,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 193,211,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit  
State deferred tax provision                 (5,993,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (6,659,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (33,273,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit  
Total deferred tax provision (benefit)                 35,174,000us-gaap_DeferredIncomeTaxExpenseBenefit 106,022,000us-gaap_DeferredIncomeTaxExpenseBenefit 159,938,000us-gaap_DeferredIncomeTaxExpenseBenefit  
Provision for income taxes 57,151,000us-gaap_IncomeTaxExpenseBenefit 53,870,000us-gaap_IncomeTaxExpenseBenefit 57,475,000us-gaap_IncomeTaxExpenseBenefit 52,097,000us-gaap_IncomeTaxExpenseBenefit 52,029,000us-gaap_IncomeTaxExpenseBenefit 65,047,000us-gaap_IncomeTaxExpenseBenefit 55,269,000us-gaap_IncomeTaxExpenseBenefit 55,129,000us-gaap_IncomeTaxExpenseBenefit 220,593,000us-gaap_IncomeTaxExpenseBenefit 227,474,000us-gaap_IncomeTaxExpenseBenefit 202,291,000us-gaap_IncomeTaxExpenseBenefit  
Gross Unrecognized Tax Benefits Reconcilement [Line Items]                        
Unrecognized Tax Benefits, Beginning Balance       704,000us-gaap_UnrecognizedTaxBenefits         704,000us-gaap_UnrecognizedTaxBenefits   6,246,000us-gaap_UnrecognizedTaxBenefits  
Gross increases for tax positions taken during prior years                 468,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions    
Gross decreases for tax positions taken during prior years                 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (5,048,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions    
Unrecognized Tax Benefits, Ending Balance 1,172,000us-gaap_UnrecognizedTaxBenefits       704,000us-gaap_UnrecognizedTaxBenefits       1,172,000us-gaap_UnrecognizedTaxBenefits 704,000us-gaap_UnrecognizedTaxBenefits    
Provision (benefit) for income taxes reconcilement                        
Provision (benefit) for income taxes computed at the statutory rate                 298,545,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 304,065,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 291,753,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
Tax-exempt interest income                 (17,971,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome (34,378,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome (15,752,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome  
Tax-exempt bank owned life insurance income                 (19,967,000)hban_EffectiveIncomeTaxReconciliationTaxExemptBankOwnedLifeInsuranceIncome (19,747,000)hban_EffectiveIncomeTaxReconciliationTaxExemptBankOwnedLifeInsuranceIncome (19,151,000)hban_EffectiveIncomeTaxReconciliationTaxExemptBankOwnedLifeInsuranceIncome  
Dividends                 0us-gaap_IncomeTaxReconciliationDeductionsDividends 0us-gaap_IncomeTaxReconciliationDeductionsDividends 0us-gaap_IncomeTaxReconciliationDeductionsDividends  
General business credits                 (46,047,000)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment (39,868,000)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment (49,654,000)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment  
State deferred tax asset valuation allowance adjustment, net                 (7,430,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (6,020,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (21,251,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Capital loss                 (26,948,000)us-gaap_IncomeTaxReconciliationDispositionOfAssets (961,000)us-gaap_IncomeTaxReconciliationDispositionOfAssets (18,659,000)us-gaap_IncomeTaxReconciliationDispositionOfAssets  
Affordable housing investment amortization                 33,752,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization 16,851,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization 28,855,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization  
State income taxes, net                 2,873,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 4,472,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 4,152,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes  
Other, net                 3,786,000us-gaap_IncomeTaxReconciliationOtherAdjustments 3,060,000us-gaap_IncomeTaxReconciliationOtherAdjustments 1,998,000us-gaap_IncomeTaxReconciliationOtherAdjustments  
Provision for income taxes 57,151,000us-gaap_IncomeTaxExpenseBenefit 53,870,000us-gaap_IncomeTaxExpenseBenefit 57,475,000us-gaap_IncomeTaxExpenseBenefit 52,097,000us-gaap_IncomeTaxExpenseBenefit 52,029,000us-gaap_IncomeTaxExpenseBenefit 65,047,000us-gaap_IncomeTaxExpenseBenefit 55,269,000us-gaap_IncomeTaxExpenseBenefit 55,129,000us-gaap_IncomeTaxExpenseBenefit 220,593,000us-gaap_IncomeTaxExpenseBenefit 227,474,000us-gaap_IncomeTaxExpenseBenefit 202,291,000us-gaap_IncomeTaxExpenseBenefit  
Deferred Tax Assets                        
Allowance for credit losses 233,656,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       244,684,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       233,656,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 244,684,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses    
Loss and other carryforwards 161,548,000us-gaap_DeferredTaxAssetsOtherTaxCarryforwards       153,826,000us-gaap_DeferredTaxAssetsOtherTaxCarryforwards       161,548,000us-gaap_DeferredTaxAssetsOtherTaxCarryforwards 153,826,000us-gaap_DeferredTaxAssetsOtherTaxCarryforwards    
Fair value adjustments 119,512,000hban_DeferredTaxAssetsFairValueAdjustments       115,874,000hban_DeferredTaxAssetsFairValueAdjustments       119,512,000hban_DeferredTaxAssetsFairValueAdjustments 115,874,000hban_DeferredTaxAssetsFairValueAdjustments    
Tax credit carryforward 30,825,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther       50,137,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther       30,825,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther 50,137,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther    
Accrued expense / prepaid 48,656,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities       39,636,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities       48,656,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 39,636,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities    
Market Discount 12,215,000hban_Deferredtaxassetmarketdiscountonpurchasedcreditimpairedloans       20,671,000hban_Deferredtaxassetmarketdiscountonpurchasedcreditimpairedloans       12,215,000hban_Deferredtaxassetmarketdiscountonpurchasedcreditimpairedloans 20,671,000hban_Deferredtaxassetmarketdiscountonpurchasedcreditimpairedloans    
Partnership investments 24,123,000us-gaap_DeferredTaxAssetsInvestments       13,552,000us-gaap_DeferredTaxAssetsInvestments       24,123,000us-gaap_DeferredTaxAssetsInvestments 13,552,000us-gaap_DeferredTaxAssetsInvestments    
Purchase accounting adjustments 13,839,000hban_DeferredTaxAssetsPurchaseAccountingAdjustments       14,096,000hban_DeferredTaxAssetsPurchaseAccountingAdjustments       13,839,000hban_DeferredTaxAssetsPurchaseAccountingAdjustments 14,096,000hban_DeferredTaxAssetsPurchaseAccountingAdjustments    
Other 9,477,000us-gaap_DeferredTaxAssetsOther       10,437,000us-gaap_DeferredTaxAssetsOther       9,477,000us-gaap_DeferredTaxAssetsOther 10,437,000us-gaap_DeferredTaxAssetsOther    
Total deferred tax assets 653,851,000us-gaap_DeferredTaxAssetsGross       662,913,000us-gaap_DeferredTaxAssetsGross       653,851,000us-gaap_DeferredTaxAssetsGross 662,913,000us-gaap_DeferredTaxAssetsGross    
Deferred Tax Liabilities                        
Lease financing 202,298,000us-gaap_DeferredTaxLiabilitiesLeasingArrangements       146,814,000us-gaap_DeferredTaxLiabilitiesLeasingArrangements       202,298,000us-gaap_DeferredTaxLiabilitiesLeasingArrangements 146,814,000us-gaap_DeferredTaxLiabilitiesLeasingArrangements    
Purchase accounting adjustments 17,299,000hban_DeferredTaxLiabilitiesPurchaseAccountingAdjustments       39,578,000hban_DeferredTaxLiabilitiesPurchaseAccountingAdjustments       17,299,000hban_DeferredTaxLiabilitiesPurchaseAccountingAdjustments 39,578,000hban_DeferredTaxLiabilitiesPurchaseAccountingAdjustments    
Loan origination costs 103,025,000us-gaap_DeferredTaxLiabilitiesFinancingArrangements       82,345,000us-gaap_DeferredTaxLiabilitiesFinancingArrangements       103,025,000us-gaap_DeferredTaxLiabilitiesFinancingArrangements 82,345,000us-gaap_DeferredTaxLiabilitiesFinancingArrangements    
Mortgage servicing rights 47,748,000us-gaap_DeferredTaxLiabilitiesMortgageServicingRights       48,007,000us-gaap_DeferredTaxLiabilitiesMortgageServicingRights       47,748,000us-gaap_DeferredTaxLiabilitiesMortgageServicingRights 48,007,000us-gaap_DeferredTaxLiabilitiesMortgageServicingRights    
Securities adjustments 27,856,000us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities       33,719,000us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities       27,856,000us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities 33,719,000us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities    
Operating assets 50,266,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       46,524,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       50,266,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 46,524,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Pension and other employee benefits 9,677,000hban_DeferredTaxLiabilitiesPensionAndOtherEmployeeBenefits       12,608,000hban_DeferredTaxLiabilitiesPensionAndOtherEmployeeBenefits       9,677,000hban_DeferredTaxLiabilitiesPensionAndOtherEmployeeBenefits 12,608,000hban_DeferredTaxLiabilitiesPensionAndOtherEmployeeBenefits    
Other 5,178,000us-gaap_DeferredTaxLiabilitiesOther       11,313,000us-gaap_DeferredTaxLiabilitiesOther       5,178,000us-gaap_DeferredTaxLiabilitiesOther 11,313,000us-gaap_DeferredTaxLiabilitiesOther    
Total deferred tax liabilities 463,347,000us-gaap_DeferredTaxLiabilities       420,908,000us-gaap_DeferredTaxLiabilities       463,347,000us-gaap_DeferredTaxLiabilities 420,908,000us-gaap_DeferredTaxLiabilities    
Net deferred tax asset before valuation 190,504,000hban_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance       242,005,000hban_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance       190,504,000hban_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance 242,005,000hban_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowance    
Valuation allowance (73,057,000)us-gaap_DeferredTaxAssetsValuationAllowance       (111,435,000)us-gaap_DeferredTaxAssetsValuationAllowance       (73,057,000)us-gaap_DeferredTaxAssetsValuationAllowance (111,435,000)us-gaap_DeferredTaxAssetsValuationAllowance    
Total net deferred tax asset 117,447,000us-gaap_DeferredTaxAssetsLiabilitiesNet       130,570,000us-gaap_DeferredTaxAssetsLiabilitiesNet       117,447,000us-gaap_DeferredTaxAssetsLiabilitiesNet 130,570,000us-gaap_DeferredTaxAssetsLiabilitiesNet    
Income Taxes Textuals [Abstract]                        
Interest expense (benefit) recognized on income tax assessments or income tax refunds                 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense 200,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense 100,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense  
Total interest accrued on the unrecognized tax benefits 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued       100,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued       0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 100,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued    
Tax benefits associated with securities transactions 0hban_CurrentFederalTaxExpenseBenefitSecuritiesTransactions       0hban_CurrentFederalTaxExpenseBenefitSecuritiesTransactions       0hban_CurrentFederalTaxExpenseBenefitSecuritiesTransactions 0hban_CurrentFederalTaxExpenseBenefitSecuritiesTransactions   1,700,000hban_CurrentFederalTaxExpenseBenefitSecuritiesTransactions
Net operating loss carryforward, federal 5,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic               5,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic      
Net operating loss carryfoward, state 52,100,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal               52,100,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal      
Alternative minimum tax credit carryforward 50,100,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax               50,100,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax      
General business credit carryover 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness               0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness      
Capital loss carryforward 96,300,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards               96,300,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards      
Charitable contribution carryforward $ 0us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards               $ 0us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards