Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Defined Contribution Plans (Details)

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BENEFIT PLANS - Defined Contribution Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Defined contribution plan $ 31,896 $ 31,110 $ 18,238
Shares in Huntington common stock (in shares) 13,076,164 12,883,333  
Market value of Huntington common stock $ 144,622 $ 135,533  
Dividends received on shares of Huntington stock $ 3,076 $ 2,694