Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Details Textuals)

v2.4.0.6
Derivative Financial Instruments (Details Textuals) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Derivative Financial Instruments (Textuals) [Abstract]      
Credit risks from interest rate swaps used for trading purposes $ 288,500,000 $ 225,800,000 $ 309,500,000
Additional Derivative Financial Instruments (Textuals) [Abstract]      
Aggregate credit risk, net of collateral 18,100,000 37,200,000 36,400,000
Investment securities and cash collateral pledged by Huntington 235,200,000    
Investment securities and cash collateral pledged to Huntington 123,200,000    
Additional collateral to be provided in case of credit downgrades 1,100,000    
Increase (decrease) to net interest income due to derivative adjustment 24,700,000 33,900,000  
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 45,000,000    
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 400,000    
Derivative used in trading activity [Member]
      
Derivative Financial Instruments (Textuals) [Abstract]      
Net derivative liability 55,300,000 46,200,000 53,200,000
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 11,000,000,000 9,600,000,000 10,600,000,000
Derivative used in Mortgage Banking Activities [Member]
      
Derivative Financial Instruments (Textuals) [Abstract]      
Net derivative liability 6,261,000 2,120,000 (1,265,000)
Purchase of interest rate caps and derivative financial instruments, notional value 2,100,000,000 2,400,000,000 1,700,000,000
Total notional amount corresponds to trading assets, fair value 3,100,000    
Total notional amount corresponds to trading liabilities, fair value 2,800,000    
MSR hedging gains (losses) (2,200,000) (4,200,000)  
Gains (losses) related to derivative instruments Included in total MSR (2,300,000) (3,700,000)  
Total derivative liabilities $ 2,560,000 $ 1,539,000 $ 8,036,000