Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Details Textuals)

v2.3.0.15
Derivative Financial Instruments (Details Textuals) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Derivative Financial Instruments (Textuals) [Abstract]          
Credit risks from interest rate swaps used for trading purposes $ 330,900,000 $ 357,700,000 $ 330,900,000 $ 357,700,000 $ 263,000,000
Additional Derivative Financial Instruments (Textuals) [Abstract]          
Aggregate credit risk, net of collateral 38,000,000   38,000,000   39,900,000
Investment securities and cash collateral pledged by Huntington 199,000,000   199,000,000    
Investment securities and cash collateral pledged to Huntington 141,700,000   141,700,000    
Additional collateral to be provided in case of credit downgrades 3,400,000   3,400,000    
Increase (decrease) to net interest income due to derivative adjustment 27,400,000 43,900,000 89,300,000 150,300,000  
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 35,100,000   35,100,000    
Interest Rate Cap [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Purchase of interest rate caps and derivative financial instruments, notional value 900,000,000   900,000,000    
Interest rate caps sold, value 900,000,000   900,000,000    
Swap [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Total derivative liabilities 900,000   900,000    
Derivative used in trading activity [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative liability 54,300,000 38,800,000 54,300,000 38,800,000 46,300,000
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 10,700,000,000 9,400,000,000 10,700,000,000 9,400,000,000 9,800,000,000
Derivative used in Mortgage Banking Activities [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative liability (2,870,000) 5,742,000 (2,870,000) 5,742,000 21,158,000
Purchase of interest rate caps and derivative financial instruments, notional value 1,400,000,000 2,800,000,000 1,400,000,000 2,800,000,000 2,600,000,000
Total notional amount corresponds to trading assets, fair value 13,200,000   13,200,000    
Total notional amount corresponds to trading liabilities, fair value 700,000   700,000    
MSR hedging gains (losses) 30,300,000 24,300,000 39,100,000 82,500,000  
Gains (losses) related to derivative instruments Included in total MSR 30,200,000 24,200,000 39,200,000 81,900,000  
Total derivative liabilities $ 11,967,000 $ 6,983,000 $ 11,967,000 $ 6,983,000 $ 2,328,000