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Variable Interest Entities (Consolidated and Unconsolidated) (Details) (USD $)
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3 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Mar. 31, 2013
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Sep. 30, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2013
Consolidated Trusts [Member]
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Dec. 31, 2012
Consolidated Trusts [Member]
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Dec. 31, 2013
2006 Automobile Trust [Member]
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Dec. 31, 2012
2006 Automobile Trust [Member]
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Dec. 31, 2013
2009 Automobile Trust [Member]
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Dec. 31, 2012
2009 Automobile Trust [Member]
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Dec. 31, 2013
Franklin 2009 Trust [Member]
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Dec. 31, 2012
Franklin 2009 Trust [Member]
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Dec. 31, 2013
Sky Financial Capital Trust IV [Member]
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Dec. 31, 2013
Sky Financial Capital Trust III [Member]
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Dec. 31, 2013
Huntington Capital II [Member]
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Dec. 31, 2013
Huntington Capital I [Member]
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Dec. 31, 2013
Trust Preferred Securities Total [Member]
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Dec. 31, 2012
Trust Preferred Securities Total [Member]
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Dec. 31, 2013
2012-2 Automobile Trust [Member]
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Dec. 31, 2012
2012-2 Automobile Trust [Member]
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Dec. 31, 2013
2012-1 Automobile Trust [Member]
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Dec. 31, 2012
2012-1 Automobile Trust [Member]
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Dec. 31, 2013
2011 Automobile Trust [Member]
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Dec. 31, 2012
2011 Automobile Trust [Member]
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Dec. 31, 2013
Tower Hill Securities [Member]
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Dec. 31, 2012
Tower Hill Securities [Member]
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Dec. 31, 2013
Low Income Housing Tax Credit Partnerships [Member]
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Dec. 31, 2012
Low Income Housing Tax Credit Partnerships [Member]
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Dec. 31, 2011
Low Income Housing Tax Credit Partnerships [Member]
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Dec. 31, 2013
Other Investments [Member]
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Dec. 31, 2012
Other Investments [Member]
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| Assets | ||||||||||||||||||||||||||||||||||
| Cash | $ 1,001,132,000 | $ 1,262,806,000 | $ 87,733,000 | $ 103,690,000 | $ 79,153,000 | $ 91,113,000 | $ 8,580,000 | $ 12,577,000 | $ 0 | $ 0 | ||||||||||||||||||||||||
| Loans and leases | 43,120,500,000 | 40,728,425,000 | 203,457,000 | 498,924,000 | 151,171,000 | 356,162,000 | 52,286,000 | 142,762,000 | 0 | 0 | ||||||||||||||||||||||||
| Allowance for loan and lease losses | (647,870,000) | (769,075,000) | (964,828,000) | (1,249,008,000) | (711,000) | (2,671,000) | (711,000) | (2,671,000) | 0 | 0 | 0 | 0 | ||||||||||||||||||||||
| Net loans and leases | 42,472,630,000 | 39,959,350,000 | 202,746,000 | 496,253,000 | 150,460,000 | 353,491,000 | 52,286,000 | 142,762,000 | 0 | 0 | ||||||||||||||||||||||||
| Accrued income and other assets | 1,609,876,000 | 1,893,094,000 | 982,000 | 2,258,000 | 485,000 | 1,353,000 | 235,000 | 617,000 | 262,000 | 288,000 | ||||||||||||||||||||||||
| Total assets | 59,467,174,000 | 56,141,474,000 | 291,461,000 | 602,201,000 | 230,098,000 | 445,957,000 | 61,101,000 | 155,956,000 | 262,000 | 288,000 | ||||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||||||||||||
| Other long term debt | 1,349,119,000 | 158,784,000 | 0 | 2,086,000 | 0 | 2,086,000 | 0 | 0 | 0 | 0 | ||||||||||||||||||||||||
| Accrued interest and other liabilities | 1,059,888,000 | 1,155,643,000 | 262,000 | 289,000 | 0 | 1,000 | 0 | 0 | 262,000 | 288,000 | ||||||||||||||||||||||||
| Total liabilities | 53,377,021,000 | 50,362,974,000 | 262,000 | 2,375,000 | 0 | 2,087,000 | 0 | 0 | 262,000 | 288,000 | ||||||||||||||||||||||||
| Carrying amount and classification of unconsolidated trusts assets and liabilities | ||||||||||||||||||||||||||||||||||
| Total assets | 470,900,000 | 511,203,000 | 2,320,000 | 2,165,000 | 3,093,000 | 6,186,000 | 13,764,000 | 13,764,000 | 7,396,000 | 13,616,000 | 5,975,000 | 12,649,000 | 3,040,000 | 7,076,000 | 66,702,000 | 87,075,000 | 317,226,000 | 324,419,000 | 56,797,000 | 52,604,000 | ||||||||||||||
| Total liabilities | 522,270,000 | 529,941,000 | 312,894,000 | 312,894,000 | 0 | 0 | 0 | 0 | 0 | 0 | 65,000,000 | 65,000,000 | 134,604,000 | 139,797,000 | 9,772,000 | 12,250,000 | ||||||||||||||||||
| Maximum exposure to loss | 457,136,000 | 497,439,000 | 0 | 0 | 7,396,000 | 13,616,000 | 5,975,000 | 12,649,000 | 3,040,000 | 7,076,000 | 66,702,000 | 87,075,000 | 317,226,000 | 324,419,000 | 56,797,000 | 52,604,000 | ||||||||||||||||||
| Affortable Housing Tax Credit Investments [Abstract] | ||||||||||||||||||||||||||||||||||
| Affordable housing tax credit investments | 484,799,000 | 465,831,000 | ||||||||||||||||||||||||||||||||
| Amortization | 167,573,000 | 141,412,000 | ||||||||||||||||||||||||||||||||
| Net affordable housing tax credit investments | 317,226,000 | 324,419,000 | ||||||||||||||||||||||||||||||||
| Unfunded commitments | 134,604,000 | 139,797,000 | ||||||||||||||||||||||||||||||||
| Tax credits and other tax benefits recognized | 55,819,000 | 55,558,000 | 41,372,000 | |||||||||||||||||||||||||||||||
| Tax Credit Amortization Expense | 32,789,000 | 32,337,000 | 27,619,000 | |||||||||||||||||||||||||||||||
| Tax Credit Investment Losses | 1,176,000 | 676,000 | 0 | |||||||||||||||||||||||||||||||
| Variable Interest Entities (Textuals) [Abstract] | ||||||||||||||||||||||||||||||||||
| Maximum year to defer payment of interest on debenture | not exceeding five years | |||||||||||||||||||||||||||||||||
| Commitments to limited partnership interests, gross | 556,900,000 | 532,100,000 | ||||||||||||||||||||||||||||||||
| Funded Commitments to limited partnership interests | 412,500,000 | 380,000,000 | ||||||||||||||||||||||||||||||||
| Floating Rate Series B Noncumulative Perpetual Preferred Stock Exchanged | 35,500,000 | |||||||||||||||||||||||||||||||||
| Total of automobile loans transferred in securitization transactions (not used) | $ 1,000,000,000 | $ 1,300,000,000 | $ 1,000,000,000 | |||||||||||||||||||||||||||||||