Huntington Bancshares Incorporated Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases and Allowance For Credit Losses (Textuals) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 D	Dec. 31, 2014
Loans and Leases (Textuals)
Amount of security for borrowing and advances	$ 18,400,000,000
All loans with an outstanding balance which evaluated on quarterly basis for impairment	1,000,000
Amount guaranteed by U.S. Government	53,010,000hban_AmountGuaranteedByGovernment	55,012,000hban_AmountGuaranteedByGovernment
Redefault status number of days	90hban_RedefaultStatusNumberOfDays
Aggregate amount of net unamortized deferred loan origination fees and net unearned income	$ 166,100,000	$ 178,700,000
Home equity secured by first-lien other [Member]
Loans and Leases (Textuals)
Nonaccrual status number of days past due	150
Loans charged off or written down past due	150
Home equity secured by junior-lien [Member]
Loans and Leases (Textuals)
Nonaccrual status number of days past due	120
Loans charged off or written down past due	120
Residential Mortgage [Member]
Loans and Leases (Textuals)
Nonaccrual status number of days past due	150
Loans charged off or written down past due	150
Commercial and Industrial and Commercial Real Estate [Member]
Loans and Leases (Textuals)
Nonaccrual status number of days past due	90
Loans charged off or written down past due	90
Automobile and other consumer loans [Member]
Loans and Leases (Textuals)
Loans charged off or written down past due	120