Annual report pursuant to Section 13 and 15(d)

Commitments and Contingent Liabilities (Details Textual)

v2.4.1.9
Commitments and Contingent Liabilities (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Carrying amount of deferred revenue associated with guarantees $ 4,400,000us-gaap_DeferredRevenue $ 2,100,000us-gaap_DeferredRevenue    
Commitments and Contingent Liabilities (Textuals) [Abstract]        
Commitments to sell residential real estate loans 545,000,000hban_CommitmentsToSellResidentialRealEstateLoans 452,600,000hban_CommitmentsToSellResidentialRealEstateLoans    
Maturity period of forward contracts relating mortgage banking business less than one year      
Gross unrecognized tax benefit 1,172,000us-gaap_UnrecognizedTaxBenefits 704,000us-gaap_UnrecognizedTaxBenefits   6,246,000us-gaap_UnrecognizedTaxBenefits
Total interest accrued on the unrecognized tax benefits 0us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 100,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued    
Aggregate range of reasonably possible losses current legal proceedings, Min 0us-gaap_LossContingencyRangeOfPossibleLossMinimum      
Aggregate range of reasonably possible losses current legal proceedings, Max 130,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum      
Recovery from the bank as a form of unjust enrichment 0hban_RecoveryFromBankAsFormOfUnjustEnrichment      
Direct damage claimed by Plantiffs 0hban_DirectDamageClaimedByPlantiffs      
Bankruptcy trustee alleging for the amount 70,000,000hban_BankruptcyTrusteeAllegingForAmount      
Preferential transfer alleged by bankruptcy trustee 1,200,000hban_PreferentialTransferAllegedBybankruptcyTrustee      
Fraudulent transfers alleged by Teleservices bankruptcy trustee 73,000,000hban_FraudulentTransfersAllegedByBankruptcyTrustee      
Credit related to recoveries in preference actions filed 4,000,000hban_CreditRelatedToRecoveriesInPreferenceActionsFiled      
Bankruptcy trustee unable to recover 900,000hban_BankruptcyTrusteeUnableToRecover      
Bankruptcy Court recommended judgment amount in Cyberco case, principal 71,800,000hban_BankruptcyCourtRecommendedJudgmentAmountPrincipal      
Bankruptcy Court recommended judgment amount in Cyberco case, interest 8,800,000hban_BankruptcyCourtRecommendedJudgmentAmountInterest      
Operating Leases, Future Minimum Payments Due [Abstract]        
Operating Leases, Future Minimum Payments Due, Current 50,900,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent      
Operating Leases, Future Minimum Payments, Due in Two Years 47,700,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears      
Operating Leases, Future Minimum Payments, Due in Three Years 44,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears      
Operating Leases, Future Minimum Payments, Due in Four Years 41,200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears      
Operating Leases, Future Minimum Payments, Due in Five Years 37,900,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears      
Operating Leases, Future Minimum Payments, Due Thereafter 237,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter      
Operating Leases, Future Minimum Payments Due 459,200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue      
Operating Leases, Rent Expense, Net [Abstract]        
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Total 8,400,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals      
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Next Twelve Months 4,000,000hban_OperatingLeasesSubleaseRentalsCurrent      
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Two Years 2,000,000hban_OperatingLeasesSubleaseRentalsTwoYears      
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Three Years 1,000,000hban_OperatingLeasesSubleaseRentalsThreeYears      
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Four Years 600,000hban_OperatingLeasesSubleaseRentalsFourYears      
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, within Five Years 300,000hban_OperatingLeasesSubleaseRentalsFiveYears      
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Thereafter 500,000hban_OperatingLeasesSubleaseRentalsThereafter      
Total rental expense for all operating leases 57,200,000us-gaap_OperatingLeasesRentExpenseNet 55,300,000us-gaap_OperatingLeasesRentExpenseNet 54,700,000us-gaap_OperatingLeasesRentExpenseNet  
Standby Letters of Credit [Member]        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Maturity period of majority of standby letters of credit within two years      
Outstanding standby letters of credit 497,457,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember 		439,834,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember 		   
Percentage of Outstanding standby letters of credit collateralized 8000.00%hban_PercentageOfOutstandingStandbyLettersOfCreditCollateralized
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember 		     
Commercial Letters of Credit [Member]        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Maturity period of Commercial letters of credit no longer than 90 days      
Risk Level, Low [Member]        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Outstanding standby letters of credit 137,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_RiskLevelLowMember 		     
Risk Level, Medium [Member]        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Outstanding standby letters of credit 360,000,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_RiskLevelMediumMember 		     
Risk Level, High [Member]        
Additional Commitments and Contingent Liabilities (Textuals) [Abstract]        
Outstanding standby letters of credit $ 0us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_RiskLevelHighMember