Huntington Bancshares Incorporated Annual report pursuant to Section 13 and 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details)

FAIR VALUES OF ASSETS AND LIABILITIES - Significant Unobservable Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Aug. 16, 2016	Dec. 31, 2015
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Available-for-sale and other securities	$ 15,562,837		$ 8,775,441
Loans held for investment	82,319	$ 56,000	34,637
Consumer loans	$ 82,319
Derivative Liabilities \| Maximum \| Consensus Pricing \| Level 3
Quantitative information about level 3 fair value measurements
Estimated Pull through %	99.80%
Derivative Liabilities \| Minimum \| Consensus Pricing \| Level 3
Quantitative information about level 3 fair value measurements
Estimated Pull through %	11.90%
Derivative Liabilities \| Weighted Average \| Consensus Pricing \| Level 3
Quantitative information about level 3 fair value measurements
Estimated Pull through %	76.70%
MSRs \| Maximum \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Constant prepayment rate	25.70%
Spread over forward interest rate swap rates	0.092
MSRs \| Minimum \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Constant prepayment rate	7.90%
Spread over forward interest rate swap rates	0.033
MSRs \| Weighted Average \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Constant prepayment rate	14.70%
Spread over forward interest rate swap rates	0.054
Derivative Assets \| Maximum \| Consensus Pricing \| Level 3
Quantitative information about level 3 fair value measurements
Net market price	20.90%
Derivative Assets \| Minimum \| Consensus Pricing \| Level 3
Quantitative information about level 3 fair value measurements
Net market price	(3.20%)
Derivative Assets \| Weighted Average \| Consensus Pricing \| Level 3
Quantitative information about level 3 fair value measurements
Net market price	1.90%
Municipal securities \| Maximum \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Discount rate	7.20%
Cumulative default	50.00%
Loss given default	80.00%
Municipal securities \| Minimum \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Discount rate	0.30%
Cumulative default	0.10%
Loss given default	5.00%
Municipal securities \| Weighted Average \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Discount rate	3.10%
Cumulative default	2.10%
Loss given default	20.50%
Asset-backed securities \| Maximum \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Discount rate	10.90%
Cumulative prepayment rate	100.00%
Cumulative default	100.00%
Loss given default	100.00%
Cure given deferral	75.00%
Asset-backed securities \| Minimum \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Discount rate	4.60%
Cumulative prepayment rate	0.00%
Cumulative default	1.60%
Loss given default	85.00%
Cure given deferral	0.00%
Asset-backed securities \| Weighted Average \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Discount rate	6.20%
Cumulative prepayment rate	9.60%
Cumulative default	11.10%
Loss given default	96.60%
Cure given deferral	36.80%
Automobile \| Maximum \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Constant prepayment rate	154.20%
Discount rate	5.00%
Life of pool cumulative losses	2.10%
Automobile \| Minimum \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Constant prepayment rate	154.20%
Discount rate	0.20%
Life of pool cumulative losses	2.10%
Automobile \| Weighted Average \| Discounted cash flow \| Level 3
Quantitative information about level 3 fair value measurements
Constant prepayment rate	154.20%
Discount rate	2.30%
Life of pool cumulative losses	2.10%
Recurring
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
MSRs	$ 13,747		17,585
Available-for-sale and other securities	15,015,133		8,442,655
Recurring \| Level 3
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
MSRs	13,747		17,585
Derivative assets gross	5,747		6,721
Gross amounts of recognized liabilities	7,870		665
Available-for-sale and other securities	2,874,047		2,195,888
Loans held for investment	47,880
Consumer loans			1,748
Fair Value
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Available-for-sale and other securities	15,562,837		$ 8,775,441
Fair Value \| Nonrecurring
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
MSRs	171,309
Impaired loans	53,818
Other real estate owned	50,930
Fair Value \| Nonrecurring \| Level 3
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
MSRs	171,309
Impaired loans	53,818
Other real estate owned	$ 50,930