Annual report pursuant to Section 13 and 15(d)

Available-for-Sale and Other Securities (Credit Ratings) (Details 2)

v2.4.1.9
Available-for-Sale and Other Securities (Credit Ratings) (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Credit Rating by Investment Security Type [Line Items]    
Amortized Cost $ 182,924us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 212,968us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fair Value 124,664us-gaap_AvailableForSaleSecuritiesDebtSecurities 133,240us-gaap_AvailableForSaleSecuritiesDebtSecurities
AAA [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 11,461us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaaMember
16,964us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaaMember
AA +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaPlusMinusMember
0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaPlusMinusMember
A +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_PlusMinusMember
17,855us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_PlusMinusMember
BBB +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 10,161us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbPlusMinusMember
11,785us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbPlusMinusMember
Less Than BBB- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 103,042us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbLessThanMember
86,636us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbLessThanMember
Alt-A Mortgage-backed [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Amortized Cost 0us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Alt-A Mortgage-backed [Member] | AAA [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaaMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Alt-A Mortgage-backed [Member] | AA +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaPlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Alt-A Mortgage-backed [Member] | A +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_PlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Alt-A Mortgage-backed [Member] | BBB +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbPlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Alt-A Mortgage-backed [Member] | Less Than BBB- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbLessThanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
 
Pooled Trust Preferred [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Amortized Cost 139,194us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
161,730us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Fair Value 82,738us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
84,136us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Pooled Trust Preferred [Member] | AAA [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaaMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
 
Pooled Trust Preferred [Member] | AA +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaPlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
 
Pooled Trust Preferred [Member] | A +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_PlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
 
Pooled Trust Preferred [Member] | BBB +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbPlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
 
Pooled Trust Preferred [Member] | Less Than BBB- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 82,738us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbLessThanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
 
Private label CMO [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Amortized Cost 43,730us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Fair Value 41,926us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Private label CMO [Member] | AAA [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 11,461us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaaMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Private label CMO [Member] | AA +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_AaPlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Private label CMO [Member] | A +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_PlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Private label CMO [Member] | BBB +/- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value 10,161us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbPlusMinusMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
 
Private label CMO [Member] | Less Than BBB- [Member]    
Schedule of Credit Rating by Investment Security Type [Line Items]    
Fair Value $ 20,304us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ hban_CreditRatingsAxis
= hban_BbbLessThanMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember