Annual report pursuant to Section 13 and 15(d)

Other Regulatory Matters (Details)

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Other Regulatory Matters (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Huntington Bancshares Incorporated [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 amount $ 5,741,410 $ 5,556,829
Tier 1 ratio 12.02% 12.11%
Risk based capital amount 6,928,339 6,778,398
Risk based capital ratio 14.50% 14.77%
Tier 1 Leverage amount 5,741,410 5,556,829
Tier 1 Leverage ratio 10.36% 10.28%
Huntington National Bank [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 amount 5,003,247 4,245,101
Tier 1 ratio 10.49% 9.30%
Risk based capital amount 6,093,620 5,752,723
Risk based capital ratio 12.78% 12.60%
Tier 1 Leverage amount $ 5,003,247 $ 4,245,101
Tier 1 Leverage ratio 9.05% 7.89%