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

AVAILABLE-FOR-SALE AND OTHER SECURITIES - Collateralized Debt Obligation Securities (Details)

AVAILABLE-FOR-SALE AND OTHER SECURITIES - Collateralized Debt Obligation Securities (Details) $ in Thousands	Dec. 31, 2016 USD ($) issuer	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Unrealized Loss	$ (261,644)	$ (83,651)
Collateralized Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Par Value	137,197	179,574
Amortized Cost	101,210	131,991
Fair Value	76,003	100,338
Unrealized Loss	$ (25,207)	$ (31,654)
Collateralized Debt Obligations \| Alesco II
Schedule of Available-for-sale Securities [Line Items]
Number of Issuers Currently Performing \| issuer	30
Number of Issuers Currently Remaining \| issuer	32
Collateralized Debt Obligations \| ICONS
Schedule of Available-for-sale Securities [Line Items]
Par Value	$ 18,594
Amortized Cost	18,594
Fair Value	15,307
Unrealized Loss	$ (3,287)
Number of Issuers Currently Performing \| issuer	19
Number of Issuers Currently Remaining \| issuer	21
Actual Deferrals and Defaults as a % of Original Collateral	7.00%
Expected Defaults as a % of Remaining Performing Collateral	13.00%
Available-for-sale Securities, Excess Subordination	54.00%
Collateralized Debt Obligations \| MM Comm III
Schedule of Available-for-sale Securities [Line Items]
Par Value	$ 4,573
Amortized Cost	4,369
Fair Value	3,618
Unrealized Loss	$ (751)
Number of Issuers Currently Performing \| issuer	5
Number of Issuers Currently Remaining \| issuer	8
Actual Deferrals and Defaults as a % of Original Collateral	5.00%
Expected Defaults as a % of Remaining Performing Collateral	6.00%
Available-for-sale Securities, Excess Subordination	38.00%
Collateralized Debt Obligations \| Pre TSL IX
Schedule of Available-for-sale Securities [Line Items]
Par Value	$ 5,000
Amortized Cost	3,955
Fair Value	3,253
Unrealized Loss	$ (702)
Number of Issuers Currently Performing \| issuer	27
Number of Issuers Currently Remaining \| issuer	38
Actual Deferrals and Defaults as a % of Original Collateral	16.00%
Expected Defaults as a % of Remaining Performing Collateral	9.00%
Available-for-sale Securities, Excess Subordination	8.00%
Collateralized Debt Obligations \| Pre TSL XI
Schedule of Available-for-sale Securities [Line Items]
Par Value	$ 25,000
Amortized Cost	19,576
Fair Value	15,767
Unrealized Loss	$ (3,809)
Number of Issuers Currently Performing \| issuer	42
Number of Issuers Currently Remaining \| issuer	55
Actual Deferrals and Defaults as a % of Original Collateral	14.00%
Expected Defaults as a % of Remaining Performing Collateral	8.00%
Available-for-sale Securities, Excess Subordination	14.00%
Collateralized Debt Obligations \| Pre TSL XIII
Schedule of Available-for-sale Securities [Line Items]
Par Value	$ 27,530
Amortized Cost	19,106
Fair Value	17,146
Unrealized Loss	$ (1,960)
Number of Issuers Currently Performing \| issuer	47
Number of Issuers Currently Remaining \| issuer	56
Actual Deferrals and Defaults as a % of Original Collateral	9.00%
Expected Defaults as a % of Remaining Performing Collateral	11.00%
Available-for-sale Securities, Excess Subordination	29.00%
Collateralized Debt Obligations \| Reg Diversified
Schedule of Available-for-sale Securities [Line Items]
Par Value	$ 25,500
Amortized Cost	4,610
Fair Value	1,752
Unrealized Loss	$ (2,858)
Number of Issuers Currently Performing \| issuer	23
Number of Issuers Currently Remaining \| issuer	39
Actual Deferrals and Defaults as a % of Original Collateral	35.00%
Expected Defaults as a % of Remaining Performing Collateral	8.00%
Available-for-sale Securities, Excess Subordination	0.00%
Collateralized Debt Obligations \| Soloso
Schedule of Available-for-sale Securities [Line Items]
Number of Issuers Currently Performing \| issuer	30
Number of Issuers Currently Remaining \| issuer	40
Collateralized Debt Obligations \| Tropic III [Member]
Schedule of Available-for-sale Securities [Line Items]
Par Value	$ 31,000
Amortized Cost	31,000
Fair Value	19,160
Unrealized Loss	$ (11,840)
Actual Deferrals and Defaults as a % of Original Collateral	16.00%
Expected Defaults as a % of Remaining Performing Collateral	7.00%
Available-for-sale Securities, Excess Subordination	42.00%