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

Derivative Financial Instruments (Asset and liability management) (Details)

Derivative Financial Instruments (Asset and liability management) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012 Y
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	$ 1,324,875
Cash Flow Hedge	8,411,800
Notional Amount of Derivatives, Total	9,736,675
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	9,736,675
Average Maturity (years)	2.6
Fair Value	188,796
Weighted-Average Rate Receive	131.00%
Weighted-Average Rate Pay	53.00%
Asset conversion swaps - Receive Fixed - Generic [Member]
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	7,961,000
Average Maturity (years)	2.5
Fair Value	72,841
Weighted-Average Rate Receive	111.00%
Weighted-Average Rate Pay	53.00%
Asset Conversion Swaps Pay Fixed Forward Starting [Member]
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	450,800
Average Maturity (years)	2.8
Fair Value	(3,413)
Liability conversion swaps - Receive Fixed - Generic [Member]
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	1,324,875
Average Maturity (years)	3.4
Fair Value	119,368
Weighted-Average Rate Receive	288.00%
Weighted-Average Rate Pay	50.00%
Liability Conversion Swaps - Receive Fixed - Callable
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	0
Average Maturity (years)	0.0
Fair Value	0
Weighted-Average Rate Receive	0.00%
Weighted-Average Rate Pay	0.00%
Loan [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	0
Cash Flow Hedge	8,411,800
Notional Amount of Derivatives, Total	8,411,800
Investment securities [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	0
Cash Flow Hedge	0
Notional Amount of Derivatives, Total	0
Deposits [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	691,875
Cash Flow Hedge	0
Notional Amount of Derivatives, Total	691,875
Subordinated notes
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	598,000
Cash Flow Hedge	0
Notional Amount of Derivatives, Total	598,000
Other long-term debt
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	35,000
Cash Flow Hedge	0
Notional Amount of Derivatives, Total	$ 35,000