Annual report pursuant to Section 13 and 15(d)

Share Based Compensation (Assumptions) (Details)

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Share Based Compensation (Assumptions) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assumptions      
Risk-free interest rate 1.10% 1.95% 2.30%
Expected dividend yield 2.38% 2.63% 0.68%
Expected volatility of Huntington's common stock 34.90% 30.00% 38.50%
Expected option term (years) 6 years 6 years 6 years
Weighted-average grant date fair value per share $ 1.78 $ 1.40 $ 2.20