Huntington Bancshares Incorporated Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Mortgage Banking Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Interest rate lock agreements
Derivative assets:
Total derivative assets	$ 9,227		$ 9,227		$ 5,747
Derivative liabilities:
Total derivative liabilities	355		355		1,598
Forward trades and options
Derivative assets:
Total derivative assets	1,642		1,642		13,319
Derivative liabilities:
Total derivative liabilities	2,178		2,178		1,173
Derivative used in Mortgage Banking Activities
Derivatives, Fair Value [Line Items]
Gains losses related to derivative instruments Included in Mortgage securities	2,000	$ 6,000	1,000	$ 18,000
Derivative assets:
Total derivative assets	10,869		10,869		19,066
Derivative liabilities:
Total derivative liabilities	$ 2,533		$ 2,533		$ 2,771