Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
group
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Derivative [Line Items]          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 6,000   $ 6,000    
Derivative Financial Instruments (Textuals) [Abstract]          
Purchase of interest rate caps and derivative financial instruments, notional value 11,525,000   11,525,000   $ 500,000
Total notional amount corresponds to trading assets, fair value 12,000   12,000    
Notional amount corresponds to trading liabilities, fair value (less than) 0   0    
Credit risks from interest rate swaps used for trading purposes 349,000   $ 349,000   224,000
Additional Derivative Financial Instruments (Textuals) [Abstract]          
Number of primary groups | group     2    
Aggregate credit risk, net of collateral 28,000   $ 28,000   15,000
Investment securities and cash collateral pledged by Huntington 138,000   138,000    
Investment securities and cash collateral pledged to Huntington 111,000   111,000    
Increase (decrease) to net interest income due to derivative adjustment 19,000 $ 26,000 40,000 $ 51,000  
Derivative used in trading activity          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative asset (liability) 72,000   72,000   76,000
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 15,000,000   15,000,000   14,600,000
Derivative used in Mortgage Banking Activities          
Derivative Financial Instruments (Textuals) [Abstract]          
Net derivative asset (liability) 6,858   6,858   7,730
Purchase of interest rate caps and derivative financial instruments, notional value 200,000   200,000    
Gains (losses) related to derivative instruments Included in total MSR 6,000 $ (9,000) 18,000 $ (4,000)  
Total derivative liabilities 8,924   8,924   1,459
Other Credit Derivatives          
Derivative Financial Instruments (Textuals) [Abstract]          
Derivative Asset, Notional Amount $ 400,000   $ 400,000   $ 344,000