Annual report pursuant to Section 13 and 15(d)

Fair Values of Assets and Liabilities (Non-recurring/fair values of financial instruments) (Details 5)

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Fair Values of Assets and Liabilities (Non-recurring/fair values of financial instruments) (Details 5) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Carrying Amount [Member]
Dec. 31, 2011
Carrying Amount [Member]
Dec. 31, 2012
Fair Value [Member]
Dec. 31, 2011
Fair Value [Member]
Dec. 31, 2012
Level 1 [Member]
Fair Value [Member]
Dec. 31, 2011
Level 1 [Member]
Fair Value [Member]
Dec. 31, 2012
Level 2 [Member]
Fair Value [Member]
Dec. 31, 2011
Level 2 [Member]
Fair Value [Member]
Dec. 31, 2012
Level 3 [Member]
Fair Value [Member]
Dec. 31, 2011
Level 3 [Member]
Fair Value [Member]
Dec. 31, 2012
Total Estimated Fair Value [Member]
Fair Value [Member]
Dec. 31, 2011
Total Estimated Fair Value [Member]
Fair Value [Member]
Dec. 31, 2012
Nonrecurring Basis [Member]
Dec. 31, 2012
Nonrecurring Basis [Member]
Level 1 [Member]
Dec. 31, 2012
Nonrecurring Basis [Member]
Level 2 [Member]
Dec. 31, 2012
Nonrecurring Basis [Member]
Level 3 [Member]
Assets measured at fair value on a nonrecurring basis                                    
Fair value, Impaired loans                             $ 150,873 $ 0 $ 0 $ 150,873
Gain/(Losses), Impaired loans                             (43,386)      
Fair value, Accrued income and other assets                             28,097 0 0 28,097
Gain/(Losses), Accrued income and other assets                             (8,284)      
Financial Assets:                                    
Cash and short-term assets     1,333,727 1,206,911 1,333,727 1,206,911                        
Trading account securities 91,205 45,899 91,205 45,899 91,205 45,899                        
Loans held for sale 764,309 [1] 1,618,391 [1] 764,309 1,618,391 773,013 1,638,276 0 0 0 0 316,007 1,291,755 316,007 1,291,755        
Available-for-sale and other securities 7,566,175 8,078,014 7,566,175 8,078,014 7,566,175 8,078,014                        
Held-to-maturity securities, Total 1,743,876 640,551 1,743,876 640,551 1,794,105 660,186 0 0 1,794,105 660,186 0 0 1,794,105 660,186        
Net loans and direct financing leases 39,959,350 37,958,955 39,959,350 37,958,955 38,401,965 36,669,829 0 0 0 0 38,259,203 36,373,579 38,259,203 36,373,579        
Derivatives     385,697 403,002 385,697 403,002                        
Financial Liabilities:                                    
Deposits 46,252,683 43,279,625 46,252,683 43,279,625 46,330,715 43,406,125 0 0 39,136,127 35,049,194 7,194,588 8,356,931 46,330,715 43,406,125        
Short-term borrowings 589,814 1,441,092 589,814 1,441,092 584,671 1,429,717 0 0 0 0 584,671 1,429,717 584,671 1,429,717        
Federal Home Loan Bank advances 1,008,959 362,972 1,008,959 362,972 1,008,959 362,972                        
Other long term debt 158,784 [2] 1,231,517 [2] 158,784 1,231,517 156,719 1,232,975 0 0 2,124 937,959 154,595 171,977 156,719 1,109,936        
Subordinated notes 1,197,091 1,503,368 1,197,091 1,503,368 1,183,827 1,410,392 0 0 0 0 1,183,827 1,410,392 1,183,827 1,410,392        
Derivatives     $ 152,188 $ 265,316 $ 152,188 $ 265,316                        
[1] Amounts represent loans for which Huntington has elected the fair value option. See Note 19.
[2] Amounts represent certain assets and liabilities of a consolidated VIE for which Huntington has elected the fair value option. See Note 21.