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 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Swap [Member]
Mar. 31, 2013
Swap [Member]
Mar. 31, 2014
Derivative used in trading activity [Member]
Dec. 31, 2013
Derivative used in trading activity [Member]
Mar. 31, 2014
Derivative used in Mortgage Banking Activities [Member]
Dec. 31, 2013
Derivative used in Mortgage Banking Activities [Member]
Derivative Financial Instruments (Textuals) [Abstract]                  
Net derivative asset (liability)           $ 80,000,000 $ 80,500,000 $ 5,941,000 $ 6,792,000
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value           14,700,000,000 14,300,000,000    
Credit risks from interest rate swaps used for trading purposes 161,200,000   160,400,000            
Purchase of interest rate caps and derivative financial instruments, notional value     500,000,000         400,000,000  
Total notional amount corresponds to trading assets, fair value 800,000   900,000            
Gains (losses) related to derivative instruments Included in total MSR               1,700,000 7,900,000
Total derivative liabilities       400,000 400,000     561,000 271,000
Additional Derivative Financial Instruments (Textuals) [Abstract]                  
Aggregate credit risk, net of collateral 18,800,000   15,200,000            
Investment securities and cash collateral pledged by Huntington 118,800,000                
Investment securities and cash collateral pledged to Huntington 104,700,000                
Increase (decrease) to net interest income due to derivative adjustment 24,600,000 25,100,000              
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings $ 31,300,000