Annual report pursuant to Section 13 and 15(d)

Short Term Borrowings (Details)

v2.4.1.9
Short Term Borrowings (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Short-term Debt [Line Items]        
Short Term Borrowings $ 2,397,101,000us-gaap_ShortTermBorrowings $ 2,352,143,000us-gaap_ShortTermBorrowings    
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]        
Short-term Debt [Line Items]        
Short Term Borrowings 1,058,096,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
548,605,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
   
Weighted average interest rate at year-end 0.08%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
0.06%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
  0.15%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
Maximum amount outstanding at month-end during the year 1,491,350,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
787,127,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
1,590,082,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
 
Average amount outstanding during the year 987,156,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
692,481,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
1,293,348,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
 
Weighted average interest rate during the year 0.07%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
0.08%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
  0.14%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseMember
OtherBorrowings [Member]        
Short-term Debt [Line Items]        
Short Term Borrowings 14,005,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
3,538,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
   
Weighted average interest rate at year-end 1.11%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
2.59%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
  1.98%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Maximum amount outstanding at month-end during the year 56,124,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
19,497,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
26,071,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
 
Average amount outstanding during the year 20,797,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
7,815,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
16,983,000us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
 
Weighted average interest rate during the year 1.63%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
1.79%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
  1.36%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Federal Home Loan Bank Advances [Member]        
Short-term Debt [Line Items]        
Short Term Borrowings 1,325,000,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
1,800,000,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
   
Maximum amount outstanding at month-end during the year 2,375,000,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
1,800,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
1,000,000us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
Average amount outstanding during the year $ 1,753,045us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
$ 702,262us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
$ 286,530us-gaap_ShorttermDebtAverageOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
Weighted average interest rate during the year 0.06%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.04%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.17%hban_ShortTermDebtWeightedAverageInterestRateDuringYear
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Weighted Average Interest Rate 0.14%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.02%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
0.03%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember