Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments (Details Textuals)

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Derivative Financial Instruments (Details Textuals) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Additional Derivative Financial Instruments (Textuals) [Abstract]      
Aggregate credit risk, net of collateral $ 36,400,000 $ 39,900,000  
Investment securities and cash collateral pledged by Huntington 233,500,000    
Investment securities and cash collateral pledged to Huntington 127,000,000    
Additional collateral to be provided in case of credit downgrades 3,500,000    
Increase (decrease) to net interest income due to derivative adjustment 113,900,000 192,200,000 167,900,000
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 30,200,000,000    
Interest Rate Cap [Member]
      
Derivative Financial Instruments (Textuals) [Abstract]      
Purchase of interest rate caps and derivative financial instruments, notional value 800,000,000    
Interest rate caps sold, value 800,000,000    
Swap [Member]
      
Derivative Financial Instruments (Textuals) [Abstract]      
Total derivative liabilities 6,800,000,000    
Derivative used in trading activity [Member]
      
Derivative Financial Instruments (Textuals) [Abstract]      
Net derivative liability 53,200,000 46,300,000  
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 10,600,000,000 9,800,000,000  
Credit risks from interest rate swaps used for trading purposes 309,500,000 263,000,000  
Derivative used in Mortgage Banking Activities [Member]
      
Derivative Financial Instruments (Textuals) [Abstract]      
Net derivative liability (1,265,000) 21,158,000  
Purchase of interest rate caps and derivative financial instruments, notional value 1,700,000,000 2,600,000,000  
Total notional amount corresponds to trading assets, fair value 10,500,000    
MSR hedging gains (losses) 42,100,000 55,000,000 (37,800,000)
Gains (losses) related to derivative instruments Included in total MSR 42,200,000 64,600,000 (41,200,000)
Total derivative liabilities $ 8,036,000 $ 2,328,000