Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Carrying Amount [Member]
Dec. 31, 2011
Carrying Amount [Member]
Sep. 30, 2012
Fair Value [Member]
Dec. 31, 2011
Fair Value [Member]
Sep. 30, 2012
Level 1 [Member]
Fair Value [Member]
Dec. 31, 2011
Level 1 [Member]
Fair Value [Member]
Sep. 30, 2012
Level 2 [Member]
Fair Value [Member]
Dec. 31, 2011
Level 2 [Member]
Fair Value [Member]
Sep. 30, 2012
Level 3 [Member]
Fair Value [Member]
Dec. 31, 2011
Level 3 [Member]
Fair Value [Member]
Sep. 30, 2012
Total Estimated Fair Value [Member]
Fair Value [Member]
Dec. 31, 2011
Total Estimated Fair Value [Member]
Fair Value [Member]
Sep. 30, 2012
Nonrecurring Basis [Member]
Sep. 30, 2012
Nonrecurring Basis [Member]
Level 1 [Member]
Sep. 30, 2012
Nonrecurring Basis [Member]
Level 2 [Member]
Sep. 30, 2012
Nonrecurring Basis [Member]
Level 3 [Member]
Assets measured at fair value on a nonrecurring basis                                    
Fair value, Impaired loans                             $ 129,312 $ 0 $ 0 $ 129,312
Gain/(Losses), Impaired loans                             (41,322)      
Fair value, Accrued income and other assets                             54,206 0 0 54,206
Gain/(Losses), Accrued income and other assets                             (2,113)      
Financial Assets:                                    
Cash and short-term assets     863,236 1,206,911 863,236 1,206,911                        
Trading account securities 91,970 45,899 91,970 45,899 91,970 45,899                        
Loans held for sale 1,852,919 [1] 1,618,391 [1] 1,852,919 1,618,391 1,890,882 1,638,276 0 0 0 0 1,369,610 1,291,755 1,369,610 1,291,755        
Available-for-sale and other securities 7,778,568 8,078,014 7,778,568 8,078,014 7,778,568 8,078,014                        
Held-to-maturity securities, Total 1,582,150 640,551 1,582,150 640,551 1,624,970 660,186 0 0 1,624,970 660,186 0 0 1,624,970 660,186        
Net loans and direct financing leases 39,471,275 37,958,955 39,471,275 37,958,955 37,944,350 36,669,829 0 0 0 0 37,770,711 36,373,579 37,770,711 36,373,579        
Derivatives     442,410 403,002 442,410 403,002                        
Financial Liabilities:                                    
Deposits 46,741,286 43,279,625 46,741,286 43,279,625 46,833,300 43,406,125 0 0 39,291,228 35,049,194 7,542,072 8,356,931 46,833,300 43,406,125        
Short-term borrowings 1,259,771 1,441,092 1,259,771 1,441,092 1,252,276 1,429,717 0 0 0 0 1,252,276 1,429,717 1,252,276 1,429,717        
Federal Home Loan Bank advances 9,406 362,972 9,406 362,972 9,406 362,972                        
Other long term debt 185,613 [2] 1,231,517 [2] 185,613 1,231,517 182,703 1,232,975 0 0 29,038 937,959 153,665 171,977 182,703 1,109,936        
Subordinated notes 1,306,273 1,503,368 1,306,273 1,503,368 1,285,493 1,410,392 0 0 0 0 1,285,493 1,410,392 1,285,493 1,410,392        
Derivatives     $ 181,055 $ 265,316 $ 181,055 $ 265,316                        
[1] Amounts represent loans for which Huntington has elected the fair value option.
[2] Amounts represent certain assets and liabilities of a consolidated VIE for which Huntington has elected the fair value option.