Annual report pursuant to Section 13 and 15(d)

Benefit Plans (Details 1)

v2.4.1.9
Benefit Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of plan assets investments    
Fair value of plan assets $ 653,013us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 649,020us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Fair value of plan assets, Percentage 100.00%hban_FairValueOfPlanAssetsPercentage 100.00%hban_FairValueOfPlanAssetsPercentage
Huntington funds - money market [Member]    
Summary of plan assets investments    
Fair value of plan assets 16,136us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_MoneyMarketFundsMember
803us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_MoneyMarketFundsMember
Fair value of plan assets, Percentage 2.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_MoneyMarketFundsMember
0.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_MoneyMarketFundsMember
Huntington funds - fixed income funds [Member]    
Summary of plan assets investments    
Fair value of plan assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
74,048us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
Fair value of plan assets, Percentage 0.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
11.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
Corporate Obligations [Member]    
Summary of plan assets investments    
Fair value of plan assets 218,077us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CorporateDebtSecuritiesMember
180,757us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CorporateDebtSecuritiesMember
Fair value of plan assets, Percentage 33.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CorporateDebtSecuritiesMember
28.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CorporateDebtSecuritiesMember
U.S. Government Obligations [Member]    
Summary of plan assets investments    
Fair value of plan assets 62,627us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_UsGovernmentObligationsMember
51,932us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_UsGovernmentObligationsMember
Fair value of plan assets, Percentage 10.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_UsGovernmentObligationsMember
8.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_UsGovernmentObligationsMember
Mutual funds - fixed income    
Summary of plan assets investments    
Fair value of plan assets 34,761us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherFixedIncomeMutualFundsMember
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherFixedIncomeMutualFundsMember
Fair value of plan assets, Percentage 5.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherFixedIncomeMutualFundsMember
0.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherFixedIncomeMutualFundsMember
U.S. Government Agencies [Member]    
Summary of plan assets investments    
Fair value of plan assets 7,445us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_USTreasuryAndGovernmentMember
6,146us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_USTreasuryAndGovernmentMember
Fair value of plan assets, Percentage 1.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_USTreasuryAndGovernmentMember
1.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_USTreasuryAndGovernmentMember
Mutual Funds - equities    
Summary of plan assets investments    
Fair value of plan assets 147,191us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherEquityMutualFundsMember
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherEquityMutualFundsMember
Fair value of plan assets, Percentage 23.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherEquityMutualFundsMember
0.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherEquityMutualFundsMember
Other Common Stock    
Summary of plan assets investments    
Fair value of plan assets 118,970us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherEquityFundsMemberCommonStockMember
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherEquityFundsMemberCommonStockMember
Fair value of plan assets, Percentage 18.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherEquityFundsMemberCommonStockMember
0.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_OtherEquityFundsMemberCommonStockMember
Huntington common stock [Member]    
Summary of plan assets investments    
Fair value of plan assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CommonStockMember
20,324us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CommonStockMember
Fair value of plan assets, Percentage 0.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CommonStockMember
3.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CommonStockMember
Huntington funds - equity funds [Member]    
Summary of plan assets investments    
Fair value of plan assets 37,920us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityFundsMember
289,379us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityFundsMember
Fair value of plan assets, Percentage 6.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityFundsMember
45.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityFundsMember
ExchangeTradedFundsMember    
Summary of plan assets investments    
Fair value of plan assets 6,840us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_ExchangeTradedFundsMember
24,705us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_ExchangeTradedFundsMember
Fair value of plan assets, Percentage 1.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_ExchangeTradedFundsMember
4.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_ExchangeTradedFundsMember
Limited Partnerships [Member]    
Summary of plan assets investments    
Fair value of plan assets $ 3,046us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_LimitedpartnershipsmemberMember
$ 926us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_LimitedpartnershipsmemberMember
Fair value of plan assets, Percentage 1.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_LimitedpartnershipsmemberMember
0.00%hban_FairValueOfPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hban_LimitedpartnershipsmemberMember