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Loans sales and securitizations (Details) (USD $)
In Thousands, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Summarize the changes in MSRs using the fair value method |
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| Fair value, beginning of period |
$ 34,236us-gaap_ServicingAssetAtFairValueAmount
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$ 35,202us-gaap_ServicingAssetAtFairValueAmount
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| Change in fair value during the period due to: |
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| Time decay |
2,232hban_TimeDecay
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[1] |
2,648hban_TimeDecay
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[1] |
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| Payoffs |
5,814hban_ServicingAssetAtFairValuePayoffs
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[2] |
11,851hban_ServicingAssetAtFairValuePayoffs
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[2] |
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| Changes in valuation inputs or assumptions |
(3,404)us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions
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[3] |
13,533us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions
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[3] |
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| Fair value, end of period |
22,786us-gaap_ServicingAssetAtFairValueAmount
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34,236us-gaap_ServicingAssetAtFairValueAmount
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35,202us-gaap_ServicingAssetAtFairValueAmount
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| Residential Mortgage [Member] |
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| Summarizes activity relating to loans sold securitized with servicing retained |
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| Loans sold with servicing retained |
2,330,060hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
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3,221,239hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
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3,954,762hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
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| Pretax gains resulting from above loan sales |
57,590us-gaap_GainLossOnSaleOfMortgageLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
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[4] |
102,935us-gaap_GainLossOnSaleOfMortgageLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
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[4] |
128,408us-gaap_GainLossOnSaleOfMortgageLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
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[4] |
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| Residential Mortgage [Member] | Fair value method |
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| Change in fair value during the period due to: |
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| Weighted-average life (in years) |
4 years 3 months 0 days
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4 years 2 months 0 days
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| Residential Mortgage [Member] | Amortization method |
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| Change in fair value during the period due to: |
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| Weighted-average life (in years) |
6 years 9 months 0 days
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6 years 10 months 0 days
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| Automobile Loan [Member] |
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| Summarizes activity relating to loans sold securitized with servicing retained |
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| Loans sold with servicing retained |
0hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
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0hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
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169,324hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember
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| Automobile Loan [Member] | Amortization method |
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| Change in fair value during the period due to: |
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| Weighted-average life (in years) |
3 years 7 months 0 days
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3 years 7 months 0 days
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| Small Business Association (SBA) Loan [Member] |
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| Summarizes activity relating to loans sold securitized with servicing retained |
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| Loans sold with servicing retained |
$ 214,760hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
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$ 178,874hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
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$ 209,540hban_LoansWithServicingRetainedSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
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| Small Business Association (SBA) Loan [Member] | Amortization method |
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| Change in fair value during the period due to: |
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| Weighted-average life (in years) |
3 years 6 months 0 days
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3 years 6 months 0 days
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