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	Mar. 31, 2012 Y
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	$ 1,621,912
Cash Flow Hedge	8,065,000
Notional Amount of Derivatives, Total	9,686,912
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	9,686,912
Average Maturity (years)	2.7
Fair Value	127,601
Weighted-Average Rate Receive	1.40%
Weighted-Average Rate Pay	0.56%
Asset conversion swaps - Receive Fixed - Generic [Member]
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	8,065,000
Average Maturity (years)	2.6
Fair Value	24,649
Weighted-Average Rate Receive	1.17%
Weighted-Average Rate Pay	0.56%
Liability conversion swaps - Receive Fixed - Generic [Member]
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	1,591,912
Average Maturity (years)	3.3
Fair Value	102,720
Weighted-Average Rate Receive	2.53%
Weighted-Average Rate Pay	0.57%
Liability Conversion Swaps - Receive Fixed - Callable
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	30,000
Average Maturity (years)	8.5
Fair Value	232
Weighted-Average Rate Receive	2.98%
Weighted-Average Rate Pay	0.23%
Loan [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	0
Cash Flow Hedge	8,015,000
Notional Amount of Derivatives, Total	8,015,000
Investment securities [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	0
Cash Flow Hedge	50,000
Notional Amount of Derivatives, Total	50,000
Deposits [Member]
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	988,912
Cash Flow Hedge	0
Notional Amount of Derivatives, Total	988,912
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