Huntington Bancshares Incorporated Annual report pursuant to Section 13 and 15(d)

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

Derivative Financial Instruments (Asset and liability management) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Y
Gross notional values of derivatives used in companies Asset and Liability Management
Fair Value Hedge	$ 1,324,875
Cash Flow Hedge	9,188,000
Notional Amount of Derivatives, Total	10,512,875
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	10,512,875
Average Maturity (years)	2.9
Fair Value	169,222
Weighted-Average Rate Receive	1.25%
Weighted-Average Rate Pay	0.46%
Asset conversion swaps - Receive Fixed - Generic [Member]
Additional information about the interest rate swaps used in companies Asset and Liability Management
Notional Value	9,188,000
Average Maturity (years)	2.9
Fair Value	58,678
Weighted-Average Rate Receive	1.01%
Weighted-Average Rate Pay	0.47%
Asset Conversion Swaps Pay Fixed Generic [Member]
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%
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)	3.2
Fair Value	110,544
Weighted-Average Rate Receive	2.88%
Weighted-Average Rate Pay	0.39%
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	9,188,000
Notional Amount of Derivatives, Total	9,188,000
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