Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Details Textuals)

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Derivative Financial Instruments (Details Textuals) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Derivative Financial Instruments (Textuals) [Abstract]          
Credit risks from interest rate swaps used for trading purposes $ 331,400,000   $ 331,400,000   $ 309,500,000
MSR hedging gains (losses)     17,600,000 8,800,000  
Gains (losses) related to derivative instruments Included in total MSR     17,600,000 9,000,000  
Additional Derivative Financial Instruments (Textuals) [Abstract]          
Aggregate credit risk, net of collateral 9,600,000   9,600,000   36,400,000
Investment securities and cash collateral pledged by Huntington 203,000,000   203,000,000    
Investment securities and cash collateral pledged to Huntington 157,000,000   157,000,000    
Additional collateral to be provided in case of credit downgrades 1,000,000   1,000,000    
Increase (decrease) to net interest income due to derivative adjustment 27,700,000 28,100,000 52,400,000 62,000,000  
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 42,300,000   42,300,000    
Interest Rate Cap [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Purchase of interest rate caps and derivative financial instruments, notional value 700,000,000   700,000,000    
Interest rate caps sold, value 700,000,000   700,000,000    
Swap [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Total derivative liabilities 400,000   400,000    
Derivative used in trading activity [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative liability 59,600,000   59,600,000   53,200,000
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 11,700,000,000   11,700,000,000   10,600,000,000
Derivative used in Mortgage Banking Activities [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative liability 5,374,000   5,374,000   (1,265,000)
Purchase of interest rate caps and derivative financial instruments, notional value 1,700,000 9,000,000,000 1,700,000 9,000,000,000 1,700,000,000
Total notional amount corresponds to trading assets, fair value 13,200,000   13,200,000    
MSR hedging gains (losses) 19,800,000 13,100,000      
Gains (losses) related to derivative instruments Included in total MSR 19,800,000     12,600,000  
Total derivative liabilities $ 7,650,000   $ 7,650,000   $ 8,036,000