FAIR VALUES OF ASSETS AND LIABILITIES (Tables)

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FAIR VALUES OF ASSETS AND LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2017
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, 2017 and December 31, 2016 are summarized below:   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   March 31, 2017 (dollar amounts in thousands) Level 1   Level 2   Level 3     Assets                   Loans held for sale $ —   $ 423,324   $ —   $ —   $ 423,324 Loans held for investment —   54,123   44,219   —   98,342 Trading account securities:                   Municipal securities —   3,434   —   —   3,434 Other securities 94,201   150   —   —   94,351   94,201   3,584   —   —   97,785 Available-for-sale and other securities:                   U.S. Treasury securities 6,890   —   —   —   6,890 Federal agencies: Mortgage-backed —   11,221,867   —   —   11,221,867 Federal agencies: Other agencies —   89,843   —   —   89,843 Municipal securities —   449,502   2,867,652   —   3,317,154 Asset-backed securities —   707,445   59,492   —   766,937 Corporate debt —   198,681   —   —   198,681 Other securities 15,632   3,973   —   —   19,605   22,522   12,671,311   2,927,144   —   15,620,977 MSRs —   —   13,307   —   13,307 Derivative assets —   342,584   9,439   (173,603 )   178,420 Liabilities                   Derivative liabilities —   322,999   6,745   (246,192 )   83,552 Short-term borrowings 1,420   —   —   —   1,420   Fair Value Measurements at Reporting Date Using   Netting Adjustments (1)   December 31, 2016 (dollar amounts in thousands) Level 1   Level 2   Level 3     Assets                   Loans held for sale $ —   $ 438,224   $ —   $ —   $ 438,224 Loans held for investment —   34,439   47,880   —   82,319 Trading account securities:                   Municipal securities —   1,148   —   —   1,148 Other securities 132,147   —   —   —   132,147   132,147   1,148   —   —   133,295 Available-for-sale and other securities:                   U.S. Treasury securities 5,497   —   —   —   5,497 Federal agencies: Mortgage-backed —   10,673,342   —   —   10,673,342 Federal agencies: Other agencies —   73,542   —   —   73,542 Municipal securities —   452,013   2,798,044   —   3,250,057 Asset-backed securities —   717,478   76,003   —   793,481 Corporate debt —   198,683   —   —   198,683 Other securities 16,588   3,943   —   —   20,531   22,085   12,119,001   2,874,047   —   15,015,133 MSRs —   —   13,747   —   13,747 Derivative assets —   414,412   5,747   (181,940 )   238,219 Liabilities                   Derivative liabilities —   362,777   7,870   (272,361 )   98,286 Short-term borrowings 474   —   —   —   474 (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, 2017           Available-for-sale securities       (dollar amounts in thousands) MSRs   Derivative instruments   Municipal securities   Asset- backed securities   Loans held for investment   Opening balance $ 13,747   $ (2,123 )   $ 2,798,044   $ 76,003   $ 47,880   Transfers into Level 3 —   —   —   —   —   Transfers out of Level 3 (1) —   (333 )   —   —   —   Total gains/losses for the period:                     Included in earnings (440 )   5,150   (1,386 )   28   (63 )   Included in OCI —   —   20,475   3,172   —   Purchases/originations —   —   132,666   —   —   Sales —   —   —   (19,133 )   —   Repayments —   —   —   —   (3,598 )   Issues —   —   —   —   —   Settlements —   —   (82,147 )   (578 )   —   Closing balance $ 13,307   $ 2,694   $ 2,867,652   $ 59,492   $ 44,219   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 $ (440 )   $ 5,150   $ 20,269   $ 1,212   $ —     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   Loans held for investment 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   $ —   $ —   $ —
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, 2017 and 2016:   Level 3 Fair Value Measurements Three months ended March 31, 2017           Available-for-sale securities     (dollar amounts in thousands) MSRs   Derivative instruments   Municipal securities   Asset- backed securities   Loans held for investment Classification of gains and losses in earnings:                   Mortgage banking income $ (440 )   $ 5,150   $ —   $ —   $ — Securities gains (losses) —   —   (1,386 )   28   — Interest and fee income —   —   —   —   — Noninterest income —   —   —   —   (63 ) Total $ (440 )   $ 5,150   $ (1,386 )   $ 28   $ (63 )   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   Loans held for investment 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   $ —   $ —   $ —
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, 2017   Total Loans   Loans that are 90 or more days past due (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 $ 423,324   $ 408,424   $ 14,900   $ —   $ —   $ — Loans held for investment 98,342   110,234   (11,892 )   8,572   11,507   (2,935 )   December 31, 2016   Total Loans   Loans that are 90 or more days past due (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 $ 438,224   $ 433,760   $ 4,464   $ —   $ —   $ — Loans held for investment 82,319   91,998   (9,679 )   8,408   11,082   (2,674 ) 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, 2017 and 2016:       Net gains (losses) from fair value changes       Three months ended March 31, (dollar amounts in thousands)     2017   2016 Assets           Loans held for sale     $ 9,076   $ 4,649 Loans held for investment     (63 )   —       Gains (losses) included in fair value changes associated with instrument specific credit risk       Three months ended March 31, (dollar amounts in thousands)     2017   2016 Assets           Loans held for investment     $ —   $ 90
Assets measured at fair value on a nonrecurring basis	ssets 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, 2017 MSRs $ 176,747   $ —   $ —   $ 176,747   $ 1,800 Impaired loans 52,367   —   —   52,367   5,267 Other real estate owned 49,887   —   —   49,887   2,363
Quantitative information about significant unobservable level 3 fair value measurement inputs	Quantitative Information about Level 3 Fair Value Measurements at March 31, 2017 (dollar amounts in thousands) Fair Value   Valuation Technique   Significant Unobservable Input   Range (Weighted Average) Measured at fair value on a recurring basis: MSRs $ 13,307   Discounted cash flow   Constant prepayment rate   8.00% - 30.0% (12.0%)           Spread over forward interest rate swap rates   3.0% - 10.0% (8.4%) Derivative assets 9,439   Consensus Pricing   Net market price   -4.7% - 26.7% (2.0%) Derivative liabilities 6,745       Estimated Pull through %   9.0% - 99.0% (78.0%) Municipal securities 2,867,652   Discounted cash flow   Discount rate   0.0% - 10.3% (3.7%)           Cumulative default   0.0% - 38.4% (3.1%)           Loss given default   5.0% - 90.0% (24.0%) Asset-backed securities 59,492   Discounted cash flow   Discount rate   5.1% - 12.1% (6.4%)           Cumulative prepayment rate   0.0% - 73% (6.5%)           Cumulative default   0.9% - 100% (10.9%)           Loss given default   85% - 100% (96.1%)           Cure given deferral   0.0% - 75.0% (32.7%) Loans held for investment 44,219   Discounted cash flow   Discount rate   5.4% - 16.8% (5.6%) Measured at fair value on a nonrecurring basis: MSRs 176,747   Discounted cash flow   Constant prepayment rate   6.30% - 21.2% (8.1%)           Spread over forward interest rate swap rates   3.0% - 20.0% (10.6%) Impaired loans 52,367   Appraisal value   NA   NA Other real estate owned 49,887   Appraisal value   NA   NA   Quantitative Information about Level 3 Fair Value Measurements at December 31, 2016 (dollar amounts in thousands) Fair Value   Valuation Technique   Significant Unobservable Input   Range (Weighted Average) Measured at fair value on a recurring basis: MSRs $ 13,747   Discounted cash flow   Constant prepayment rate   5.63% - 34.4% (10.9%)           Spread over forward interest rate swap rates   3.0% - 9.2% (5.4%) Derivative assets 5,747   Consensus Pricing   Net market price   -7.1% - 25.4% (1.1%) Derivative liabilities 7,870       Estimated Pull through %   8.1% - 99.8% (76.9%) Municipal securities 2,798,044   Discounted cash flow   Discount rate   0.0% - 10.0% (3.6%)           Cumulative default   0.3% - 37.8% (4.0%)           Loss given default   5.0% - 80.0% (24.1%) Asset-backed securities 76,003   Discounted cash flow   Discount rate   5.0% - 12.0% (6.3%)           Cumulative prepayment rate   0.0% - 73% (6.5%)           Cumulative default   1.1% - 100% (11.2%)           Loss given default   85% - 100% (96.3%)           Cure given deferral   0.0% - 75.0% (36.2%) Loans held for investment 47,880   Discounted cash flow   Constant prepayment rate   5.4% - 16.2% (5.6%) Measured at fair value on a nonrecurring basis: MSRs 171,309   Discounted cash flow   Constant prepayment rate   5.57% - 30.4% (7.8%)           Spread over forward interest rate swap rates   4.2% - 20.0% (11.7%) Impaired loans 53,818   Appraisal value   NA   NA Other real estate owned 50,930   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, 2017 and December 31, 2016:   March 31, 2017   December 31, 2016 (dollar amounts in thousands) Carrying Amount   Fair Value   Carrying Amount   Fair Value Financial Assets               Cash and short-term assets $ 1,371,868   $ 1,371,868   $ 1,443,037   $ 1,443,037 Trading account securities 97,785   97,785   133,295   133,295 Loans held for sale 518,238   522,121   512,951   515,640 Available-for-sale and other securities 16,173,605   16,173,605   15,562,837   15,562,837 Held-to-maturity securities 7,533,517   7,502,102   7,806,939   7,787,268 Net loans and direct financing leases 66,425,689   66,275,735   66,323,583   66,294,639 Derivatives 178,420   178,420   238,219   238,219 Financial Liabilities               Deposits 77,422,510   78,238,093   75,607,717   76,161,091 Short-term borrowings 1,263,430   1,263,430   3,692,654   3,692,654 Long-term debt 9,279,140   9,419,853   8,309,159   8,387,444 Derivatives 83,552   83,552   98,286   98,286 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, 2017 and December 31, 2016:   Estimated Fair Value Measurements at Reporting Date Using   March 31, 2017 (dollar amounts in thousands) Level 1   Level 2   Level 3   Financial Assets               Held-to-maturity securities $ —   $ 7,502,102   $ —   $ 7,502,102 Net loans and direct financing leases —   —   66,275,735   66,275,735 Financial Liabilities               Deposits —   74,456,322   3,781,771   78,238,093 Short-term borrowings 1,420   —   1,262,010   1,263,430 Long-term debt —   9,013,768   406,085   9,419,853   Estimated Fair Value Measurements at Reporting Date Using   December 31, 2016 (dollar amounts in thousands) Level 1   Level 2   Level 3   Financial Assets               Held-to-maturity securities $ —   $ 7,787,268   $ —   $ 7,787,268 Net loans and direct financing leases —   —   66,294,639   66,294,639 Financial Liabilities         Deposits —   72,319,328   3,841,763   76,161,091 Short-term borrowings 474   —   3,692,180   3,692,654 Long-term debt —   7,980,176   407,268   8,387,444