Annual report pursuant to Section 13 and 15(d)

Available-for-Sale and Other Securities (Details Textuals)

v2.4.1.9
Available-for-Sale and Other Securities (Details Textuals) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Investment Securities (Textuals)      
Fair Value, Total $ 124,664,000us-gaap_AvailableForSaleSecuritiesDebtSecurities $ 133,240,000us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Stock issued by Federal Reserve Banks included in other securities 174,500,000us-gaap_FederalReserveBankStock 155,400,000us-gaap_FederalReserveBankStock  
Pledged investment securities to secure public and trust deposits, trading account liabilities, US Treasury demand notes and security repurchase agreements 3,600,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForOtherDebtFacilities    
Loans transfered to available-for-sale securities 0hban_TransferOfPortfolioLoansAndLeasesToAvailableForSaleSecurities 600,435,000hban_TransferOfPortfolioLoansAndLeasesToAvailableForSaleSecurities 0hban_TransferOfPortfolioLoansAndLeasesToAvailableForSaleSecurities
Federal Home Loan Bank of Cincinnati [Member]      
Investment Securities (Textuals)      
Stock issued by the Federal Home Loan Bank included in other securities 157,000,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankOfCincinnatiMember
165,600,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankOfCincinnatiMember
 
Federal Home Loan Bank of Indianapolis [Member]      
Investment Securities (Textuals)      
Stock issued by the Federal Home Loan Bank included in other securities 0us-gaap_FederalHomeLoanBankStock
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankOfIndianapolisMember
0us-gaap_FederalHomeLoanBankStock
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankOfIndianapolisMember
 
Automobile Asset Backed securities [Member]      
Investment Securities (Textuals)      
Fair Value, Total $ 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hban_AutomobileAssetBackedSecuritiesMember
$ 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hban_AutomobileAssetBackedSecuritiesMember