Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2016
Derivative [Line Items]        
Increase (decrease) to net interest income due to derivative adjustment $ 72,000 $ 108,000 $ 98,000  
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings (2,000)      
Purchase of interest rate caps and derivative financial instruments, notional value 10,800,000      
Notional amount corresponds to trading liabilities, fair value 3,000      
Total notional amount corresponds to trading assets, fair value (less than) 1,000      
Credit risks from interest rate swaps used for trading purposes 196,000 224,000    
Credit risk derivative fair value 3,000 6,000    
Aggregate credit risk, net of collateral 26,000 15,000    
Investment securities and cash collateral pledged by Huntington 172,000      
Investment securities and cash collateral pledged to Huntington 90,000      
Swap        
Derivative [Line Items]        
Gross amounts of recognized liabilities (less than) 1,000      
Derivative liabilities 6,000      
Derivative used in trading activity        
Derivative [Line Items]        
Net derivative asset (liability) 80,000 76,000    
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 21,000,000 15,000,000    
Derivative used in Mortgage Banking Activities        
Derivative [Line Items]        
Gross amounts of recognized liabilities (less than) 2,771 1,459    
Purchase of interest rate caps and derivative financial instruments, notional value 300,000 500,000    
Gains (losses) related to derivative instruments Included in total MSR (1,000) (2,000) $ 7,000  
Net derivative asset (liability) 16,295 7,730    
Share Swap Economic Hedge        
Derivative [Line Items]        
Purchase of interest rate caps and derivative financial instruments, notional value       $ 20,000
Derivative, Fair Value, Net 10,000      
Other Credit Derivatives        
Derivative [Line Items]        
Derivative asset notional amount $ 582,000 $ 344,000