Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Details Textuals)

v2.4.0.8
Derivative Financial Instruments (Details Textuals) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Derivative Financial Instruments (Textuals) [Abstract]          
Credit risks from interest rate swaps used for trading purposes $ 165,700,000   $ 165,700,000   $ 160,400,000
Purchase of interest rate caps and derivative financial instruments, notional value         500,000,000
Total notional amount corresponds to trading assets, fair value 500,000   500,000    
Additional Derivative Financial Instruments (Textuals) [Abstract]          
Aggregate credit risk, net of collateral 19,100,000   19,100,000   15,200,000
Investment securities and cash collateral pledged by Huntington 116,200,000   116,200,000    
Investment securities and cash collateral pledged to Huntington 82,200,000   82,200,000    
Increase (decrease) to net interest income due to derivative adjustment 24,200,000 23,100,000 73,400,000 73,200,000  
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 26,200,000   26,200,000    
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 asset (liability) 75,600,000   75,600,000   80,500,000
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 13,500,000,000   13,500,000,000   14,300,000,000
Derivative used in Mortgage Banking Activities [Member]
          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative asset (liability) 3,400,000   3,400,000   6,792,000
Purchase of interest rate caps and derivative financial instruments, notional value 400,000,000   400,000,000    
Gains (losses) related to derivative instruments Included in total MSR (200,000)        
Total derivative liabilities $ 1,377,000   $ 1,377,000   $ 271,000