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, 2013
Mar. 31, 2012
Dec. 31, 2012
Derivative Financial Instruments (Textuals) [Abstract]      
Credit risks from interest rate swaps used for trading purposes $ 261,900,000   $ 296,100,000
Purchase of interest rate caps and derivative financial instruments, notional value 10,493,875,000    
Additional Derivative Financial Instruments (Textuals) [Abstract]      
Aggregate credit risk, net of collateral 16,200,000   17,400,000
Investment securities and cash collateral pledged by Huntington 163,400,000    
Investment securities and cash collateral pledged to Huntington 149,400,000    
Increase (decrease) to net interest income due to derivative adjustment 25,100,000 24,700,000  
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 32,100,000    
Interest Rate Cap [Member]
      
Derivative Financial Instruments (Textuals) [Abstract]      
Purchase of interest rate caps and derivative financial instruments, notional value 600,000,000    
Interest rate caps sold, value 600,000,000    
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 asset (liability) 62,000,000   63,400,000
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value     12,000,000,000
Derivative used in Mortgage Banking Activities [Member]
      
Derivative Financial Instruments (Textuals) [Abstract]      
Net derivative asset (liability) 8,014,000   11,752,000
Purchase of interest rate caps and derivative financial instruments, notional value 2,400,000   2,300,000,000
Total notional amount corresponds to trading assets, fair value 5,500,000    
MSR hedging gains (losses) (7,900,000) (2,200,000)  
Gains (losses) related to derivative instruments Included in total MSR (7,900,000) (2,300,000)  
Total derivative liabilities $ 2,222,000   $ 2,191,000