FAIR VALUES OF ASSETS AND LIABILITIES (Tables)

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FAIR VALUES OF ASSETS AND LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value on a recurring basis	Assets and Liabilities measured at fair value on a recurring basis Assets and liabilities measured at fair value on a recurring basis at March 31, 2016 and December 31, 2015 are summarized below:   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   March 31, 2016 (dollar amounts in thousands) Level 1   Level 2   Level 3     Assets                   Loans held for sale $ —   $ 364,967   $ —   $ —   $ 364,967 Loans held for investment —   38,113   —   —   38,113 Trading account securities:                   Municipal securities —   9,752   —   —   9,752 Other securities 35,539   633   —   —   36,172   35,539   10,385   —   —   45,924 Available-for-sale and other securities:                   U.S. Treasury securities 6,307   —   —   —   6,307 Federal agencies: Mortgage-backed —   4,841,992   —   —   4,841,992 Federal agencies: Other agencies —   114,496   —   —   114,496 Municipal securities —   352,013   2,281,743   —   2,633,756 Asset-backed securities —   743,045   94,329   —   837,374 Corporate debt —   536,661   —   —   536,661 Other securities 11,404   3,931   —   —   15,335   17,711   6,592,138   2,376,072   —   8,985,921 Automobile loans —   —   1,216   —   1,216 MSRs —   —   14,819   —   14,819 Derivative assets —   566,637   11,082   (219,347 )   358,372 Liabilities                   Derivative liabilities —   338,164   735   (201,418 )   137,481 Short-term borrowings —   624   —   —   624   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   December 31, 2015 (dollar amounts in thousands) Level 1   Level 2   Level 3     Assets                   Loans held for sale $ —   $ 337,577   $ —   $ —   $ 337,577 Loans held for investment —   32,889   —   —   32,889 Trading account securities:                   Municipal securities —   4,159   —   —   4,159 Other securities 32,475   363   —   —   32,838   32,475   4,522   —   —   36,997 Available-for-sale and other securities:                   U.S. Treasury securities 5,472   —   —   —   5,472 Federal agencies: Mortgage-backed —   4,521,688   —   —   4,521,688 Federal agencies: Other agencies —   115,913   —   —   115,913 Municipal securities —   360,845   2,095,551   —   2,456,396 Asset-backed securities —   761,076   100,337   —   861,413 Corporate debt —   466,477   —   —   466,477 Other securities 11,397   3,899   —   —   15,296   16,869   6,229,898   2,195,888   —   8,442,655 Automobile loans —   —   1,748   —   1,748 MSRs —   —   17,585   —   17,585 Derivative assets —   429,448   6,721   (161,297 )   274,872 Liabilities                   Derivative liabilities —   287,994   665   (144,309 )   144,350 Short-term borrowings —   1,770   —   —   1,770 (1) Amounts represent the impact of legally enforceable master netting agreements that allow the Company to settle positive and negative positions and cash collateral held or placed with the same counterparties.
Rollforward of financial instruments measured on a recurring basis and classified as Level 3	Level 3 Fair Value Measurements Three months ended March 31, 2016           Available-for-sale securities     (dollar amounts in thousands) MSRs   Derivative instruments   Municipal securities   Asset- backed securities   Automobile loans Opening balance $ 17,585   $ 6,056   $ 2,095,551   $ 100,337   $ 1,748 Transfers into Level 3 —   —   —   —   — Transfers out of Level 3 (1) —   (915 )   —   —   — Total gains/losses for the period:                   Included in earnings (2,766 )   5,206   —   —   — Included in OCI —   —   11,840   (5,168 )   — Purchases/originations —   —   237,450   —   — Sales —   —   —   —   — Repayments —   —   —   —   (532 ) Issues —   —   —   —   — Settlements —   —   (63,098 )   (840 )   — Closing balance $ 14,819   $ 10,347   $ 2,281,743   $ 94,329   $ 1,216 Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date $ (2,766 )   $ 5,306   $ —   $ —   $ — (1) Transfers out of Level 3 represent the settlement value of the derivative instruments (i.e. interest rate lock agreements) that is transferred to loans held for sale, which is classified as Level 2.   Level 3 Fair Value Measurements Three months ended March 31, 2015           Available-for-sale securities     (dollar amounts in thousands) MSRs   Derivative instruments   Municipal securities   Private- label CMO   Asset- backed securities   Automobile loans Opening balance $ 22,786   $ 3,360   $ 1,417,593   $ 30,464   $ 82,738   $ 10,590 Transfers into Level 3 —   —   —   —   —   — Transfers out of Level 3 —   —   —   —   —   — Total gains/losses for the period:                       Included in earnings (2,331 )   5,001   —   16   —   (213 ) Included in OCI —   —   (3,992 )   18   7,511   — Purchases/originations —   —   242,997   —   —   — Sales —   —   —   —   —   — Repayments —   —   —   —   —   (3,882 ) Issues —   —   —   —   —   — Settlements —   (536 )   (20,790 )   (426 )   (1,094 )   — Closing balance $ 20,455   $ 7,825   $ 1,635,808   $ 30,072   $ 89,155   $ 6,495 Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date $ (2,331 )   $ 4,465   $ (3,992 )   $ 18   $ 7,511   $ (213 )
Classification of gains and losses due to changes in fair value, recorded in earnings for Level 3 assets and liabilities	The tables below summarize the classification of gains and losses due to changes in fair value, recorded in earnings for Level 3 assets and liabilities for the three-month periods ended March 31, 2016 and 2015:   Level 3 Fair Value Measurements Three months ended March 31, 2016           Available-for-sale securities     (dollar amounts in thousands) MSRs   Derivative instruments   Municipal securities   Private- label CMO   Asset- backed securities   Automobile loans Classification of gains and losses in earnings:                       Mortgage banking income $ (2,766 )   $ 5,206   $ —   $ —   $ —   $ — Securities gains (losses) —   —   —   —   —   — Interest and fee income —   —   —   —   —   — Noninterest income —   —   —   —   —   — Total $ (2,766 )   $ 5,206   $ —   $ —   $ —   $ —   Level 3 Fair Value Measurements Three months ended March 31, 2015           Available-for-sale securities     (dollar amounts in thousands) MSRs   Derivative instruments   Municipal securities   Private- label CMO   Asset- backed securities   Automobile loans Classification of gains and losses in earnings:                       Mortgage banking income $ (2,331 )   $ 5,001   $ —   $ —   $ —   $ — Securities gains (losses) —   —   —   —   —   — Interest and fee income —   —   —   16   —   (213 ) Noninterest income —   —   —   —   —   — Total $ (2,331 )   $ 5,001   $ —   $ 16   $ —   $ (213 )
Assets and liabilities under the fair value option	The following table presents the fair value and aggregate principal balance of certain assets and liabilities under the fair value option:   March 31, 2016   December 31, 2015 (dollar amounts in thousands) Fair value carrying amount   Aggregate unpaid principal   Difference   Fair value carrying amount   Aggregate unpaid principal   Difference Assets                       Loans held for sale $ 364,967   $ 348,302   $ 16,665   $ 337,577   $ 326,802   $ 10,775 Loans held for investment 38,113   38,811   (698 )   32,889   33,637   (748 ) Automobile loans 1,216   1,216   —   1,748   1,748   — The following tables present the net gains (losses) from fair value changes, including net gains (losses) associated with instrument specific credit risk for the three-month periods ended March 31, 2016 and 2015:   Net gains (losses) from fair value changes   Three months ended March 31, (dollar amounts in thousands) 2016   2015 Assets       Loans held for sale $ 4,649   $ 1,001 Automobile loans —   (213 )   Gains (losses) included in fair value changes associated with instrument specific credit risk   Three months ended March 31, (dollar amounts in thousands) 2016   2015 Assets       Automobile loans $ 90   $ 66
Assets measured at fair value on a nonrecurring basis	Assets measured at fair value on a nonrecurring basis were as follows:       Fair Value Measurements Using     (dollar amounts in thousands) Fair Value   Quoted Prices In Active Markets for Identical Assets (Level 1)   Significant Other Observable Inputs (Level 2)   Significant Other Unobservable Inputs (Level 3)   Total Gains/(Losses) Three months ended March 31, 2016 MSRs $ 125,957   $ —   $ —   $ 125,957   $ (16,340 ) Impaired loans 68,726   —   —   68,726   1,417 Other real estate owned 26,132   —   —   26,132   (505 )
Quantitative information about significant unobservable level 3 fair value measurement inputs	Quantitative Information about Level 3 Fair Value Measurements at March 31, 2016 (dollar amounts in thousands) Fair Value   Valuation Technique   Significant Unobservable Input   Range (Weighted Average) MSRs $ 14,819   Discounted cash flow   Constant prepayment rate   7.0% - 26.5% (12.3%)           Spread over forward interest rate swap rates   3.0% - 9.2% (5.5%) Derivative assets 11,082   Consensus Pricing   Net market price   -2.5% - 22.1% (2.3%) Derivative liabilities 735       Estimated Pull through %   7.9% - 99.8% (79.4%) Municipal securities 2,281,743   Discounted cash flow   Discount rate   0.6% - 7.8% (3.5%)           Cumulative default   0.1% - 56.0% (2.9%)           Loss given default   5.0% - 80.0% (21.8%) Asset-backed securities 94,329   Discounted cash flow   Discount rate   4.9% - 11.4% (6.5%)           Cumulative prepayment rate   0.0% - 100% (9.6%)           Cumulative default   1.5% - 100% (11.1%)           Loss given default   85% - 100% (96.7%)           Cure given deferral   0.0% - 75.0% (36.5%) Automobile loans 1,216   Discounted cash flow   Constant prepayment rate   154.2 %           Discount rate   0.2% - 5.0% (2.3%)           Life of pool cumulative losses   2.1 % Impaired loans 68,726   Appraisal value   NA   NA Other real estate owned 26,132   Appraisal value   NA   NA   Quantitative Information about Level 3 Fair Value Measurements at December 31, 2015 (dollar amounts in thousands) Fair Value   Valuation Technique   Significant Unobservable Input   Range (Weighted Average) MSRs $ 17,585   Discounted cash flow   Constant prepayment rate   7.9% - 25.7% (14.7%)           Spread over forward interest rate swap rates   3.3% - 9.2% (5.4%) Derivative assets 6,721   Consensus Pricing   Net market price   -3.2% - 20.9% (1.9%) Derivative liabilities 665       Estimated Pull through %   11.9% - 99.8% (76.7%) Municipal securities 2,095,551   Discounted cash flow   Discount rate   0.3% - 7.2% (3.1%)           Cumulative default   0.1% - 50.0% (2.1%)           Loss given default   5.0% - 80.0% (20.5%) Asset-backed securities 100,337   Discounted cash flow   Discount rate   4.6% - 10.9% (6.2%)           Cumulative prepayment rate   0.0% - 100.% (9.6%)           Cumulative default   1.6% - 100% (11.1%)           Loss given default   85% - 100% (96.6%)           Cure given deferral   0.0% - 75.0% (36.8%) Automobile loans 1,748   Discounted cash flow   Constant prepayment rate   154.2 %           Discount rate   0.2% - 5.0% (2.3%)           Life of pool cumulative losses   2.1 % Impaired loans 62,029   Appraisal value   NA   NA Other real estate owned 27,342   Appraisal value   NA   NA
Carrying amounts and estimated fair values of financial instruments	The following table provides the carrying amounts and estimated fair values of Huntington’s financial instruments that are carried either at fair value or cost at March 31, 2016 and December 31, 2015:   March 31, 2016   December 31, 2015 (dollar amounts in thousands) Carrying Amount   Fair Value   Carrying Amount   Fair Value Financial Assets               Cash and short-term assets $ 882,916   $ 882,916   $ 898,994   $ 898,994 Trading account securities 45,924   45,924   36,997   36,997 Loans held for sale 567,165   570,609   474,621   484,511 Available-for-sale and other securities 9,319,381   9,319,381   8,775,441   8,775,441 Held-to-maturity securities 5,946,144   6,042,243   6,159,590   6,135,458 Net loans and direct financing leases 50,925,640   49,897,026   49,743,256   48,024,998 Derivatives 358,372   358,372   274,872   274,872 Financial Liabilities               Deposits 55,628,842   55,641,189   55,294,979   55,299,435 Short-term borrowings 471,375   471,375   615,279   615,279 Long-term debt 7,935,412   7,928,482   7,067,614   7,043,014 Derivatives 137,481   137,481   144,350   144,350 The following table presents the level in the fair value hierarchy for the estimated fair values of only Huntington’s financial instruments that are not already on the Unaudited Condensed Consolidated Balance Sheets at fair value at March 31, 2016 and December 31, 2015:   Estimated Fair Value Measurements at Reporting Date Using   March 31, 2016 (dollar amounts in thousands) Level 1   Level 2   Level 3   Financial Assets               Held-to-maturity securities $ —   $ 6,042,243   $ —   $ 6,042,243 Net loans and direct financing leases —   —   49,897,026   49,897,026 Financial Liabilities               Deposits —   52,544,042   3,097,147   55,641,189 Short-term borrowings —   624   470,751   471,375 Long-term debt —   —   7,928,482   7,928,482   Estimated Fair Value Measurements at Reporting Date Using   December 31, 2015 (dollar amounts in thousands) Level 1   Level 2   Level 3   Financial Assets               Held-to-maturity securities $ —   $ 6,135,458   $ —   $ 6,135,458 Net loans and direct financing leases —   —   48,024,998   48,024,998 Financial Liabilities         Deposits —   51,869,105   3,430,330   55,299,435 Short-term borrowings —   1,770   613,509   615,279 Long-term debt —   —   7,043,014   7,043,014