Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Details Textuals)

v3.2.0.727
Derivative Financial Instruments (Details Textuals) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative Financial Instruments (Textuals) [Abstract]          
Credit risks from interest rate swaps used for trading purposes $ 200,000   $ 200,000   $ 219,300
Purchase of interest rate caps and derivative financial instruments, notional value         600,000
Total notional amount corresponds to trading assets, fair value 1,800   1,800    
Additional Derivative Financial Instruments (Textuals) [Abstract]          
Aggregate credit risk, net of collateral 17,100   17,100   19,500
Investment securities and cash collateral pledged by Huntington 79,900   79,900    
Investment securities and cash collateral pledged to Huntington 140,100   140,100    
Increase (decrease) to net interest income due to derivative adjustment 26,200 $ 24,700 50,900 $ 49,300  
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 18,100   18,100    
Swap [Member]          
Derivative Financial Instruments (Textuals) [Abstract]          
Total derivative liabilities 400   400    
Derivative used in trading activity [Member]          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative asset (liability) 74,000   74,000   74,400
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 15,300,000   15,300,000   14,400,000
Derivative used in Mortgage Banking Activities [Member]          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative asset (liability) 11,736   11,736   80
Purchase of interest rate caps and derivative financial instruments, notional value 700,000   700,000    
Gains (losses) related to derivative instruments Included in total MSR (8,500)        
Total derivative liabilities $ 1,344   $ 1,344   $ 4,019