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

Derivative Financial Instruments (Asset and liability management) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2014 Cash flow hedging [Member]	Sep. 30, 2014 Fair Value Hedging [Member]	Sep. 30, 2014 Loan [Member] Cash flow hedging [Member]	Sep. 30, 2014 Deposits [Member] Fair Value Hedging [Member]	Sep. 30, 2014 Subordinated notes Fair Value Hedging [Member]	Sep. 30, 2014 Other long-term debt Fair Value Hedging [Member]
Notional Amount Of Derivatives [Abstract]
Derivative, Notional Amount	$ 500,000	$ 9,315,000	$ 2,829,100	$ 9,315,000	$ 69,100	$ 475,000	$ 2,285,000