Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Details Textuals)

 v2.3.0.11
Derivative Financial Instruments (Details Textuals) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Derivative Financial Instruments (Textuals) [Abstract]          
Credit risks from interest rate swaps used for trading purposes $ 252,800,000 $ 334,800,000 $ 252,800,000 $ 334,800,000 $ 263,000,000
Additional Derivative Financial Instruments (Textuals) [Abstract]          
Aggregate credit risk, net of collateral 38,500,000 42,800,000 38,500,000 42,800,000 39,900,000
Investment securities and cash collateral pledged by Huntington 201,400,000   201,400,000    
Investment securities and cash collateral pledged to Huntington 101,300,000   101,300,000    
Additional collateral to be provided in case of credit downgrades 4,300,000   4,300,000    
Increase (decrease) to net interest income due to derivative adjustment 28,100,000 48,400,000 62,000,000 106,400,000  
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 35,000,000   35,000,000    
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 1,400,000   1,400,000    
Derivative used in trading activity [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative liability 46,400,000 43,500,000 46,400,000 43,500,000 46,300,000
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 9,800,000,000 9,500,000,000 9,800,000,000 9,500,000,000 9,800,000,000
Derivative used in Mortgage Banking Activities [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative liability 113,000 (5,183,000) 113,000 (5,183,000) 21,158,000
Purchase of interest rate caps and derivative financial instruments, notional value 1,700,000,000 3,100,000,000 1,700,000,000 3,100,000,000 2,600,000,000
Total notional amount corresponds to trading assets, fair value 8,400,000   8,400,000    
Total notional amount corresponds to trading liabilities, fair value 800,000   800,000    
MSR hedging gains (losses) 13,100,000 46,300,000 8,800,000 58,200,000  
Gains (losses) related to derivative instruments Included in total MSR 12,600,000 46,100,000 900,000 57,600,000  
Total derivative liabilities $ (2,569,000) $ (13,761,000) $ (2,569,000) $ (13,761,000) $ (2,328,000)