Annual report pursuant to Section 13 and 15(d)

Variable Interest Entities (Details)

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Variable Interest Entities (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets              
Cash       $ 1,001,132,000 $ 1,262,806,000    
Loans and leases       43,120,500,000 40,728,425,000    
Allowance for loan and lease losses       (647,870,000) (769,075,000) (964,828,000) (1,249,008,000)
Net loans and leases       42,472,630,000 39,959,350,000    
Accrued income and other assets       1,619,046,000 1,904,805,000    
Total assets       59,476,344,000 56,153,185,000    
Liabilities              
Other long term debt       1,349,119,000 158,784,000    
Accrued interest and other liabilities       1,059,888,000 1,155,643,000    
Total liabilities       53,377,021,000 50,362,974,000    
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       487,516,000 526,058,000    
Total liabilities       522,270,000 529,941,000    
Maximum exposure to loss       473,752,000 512,294,000    
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        
Consolidated Trusts [Member]
              
Assets              
Cash       87,733,000 103,690,000    
Loans and leases       203,457,000 498,924,000    
Allowance for loan and lease losses       (711,000) (2,671,000)    
Net loans and leases       202,746,000 496,253,000    
Accrued income and other assets       982,000 2,258,000    
Total assets       291,461,000 602,201,000    
Liabilities              
Other long term debt       0 2,086,000    
Accrued interest and other liabilities       262,000 289,000    
Total liabilities       262,000 2,375,000    
2006 Automobile Trust [Member]
              
Assets              
Cash       79,153,000 91,113,000    
Loans and leases       151,171,000 356,162,000    
Allowance for loan and lease losses       (711,000) (2,671,000)    
Net loans and leases       150,460,000 353,491,000    
Accrued income and other assets       485,000 1,353,000    
Total assets       230,098,000 445,957,000    
Liabilities              
Other long term debt       0 2,086,000    
Accrued interest and other liabilities       0 1,000    
Total liabilities       0 2,087,000    
2009 Automobile Trust [Member]
              
Assets              
Cash       8,580,000 12,577,000    
Loans and leases       52,286,000 142,762,000    
Allowance for loan and lease losses       0 0    
Net loans and leases       52,286,000 142,762,000    
Accrued income and other assets       235,000 617,000    
Total assets       61,101,000 155,956,000    
Liabilities              
Other long term debt       0 0    
Accrued interest and other liabilities       0 0    
Total liabilities       0 0    
Other Consolidated Trusts [Member]
              
Assets              
Cash       0 0    
Loans and leases       0 0    
Allowance for loan and lease losses       0 0    
Net loans and leases       0 0    
Accrued income and other assets       262,000 288,000    
Total assets       262,000 288,000    
Liabilities              
Other long term debt       0 0    
Accrued interest and other liabilities       262,000 288,000    
Total liabilities       262,000 288,000    
Sky Financial Capital Trust IV [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       2,320,000      
Sky Financial Capital Trust III [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       2,165,000      
Huntington Capital II [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       3,093,000      
Huntington Capital I [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       6,186,000      
Trust Preferred Securities Total [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       13,764,000 13,764,000    
Total liabilities       312,894,000 312,894,000    
Maximum exposure to loss       0 0    
2012-2 Automobile Trust [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       7,396,000 13,616,000    
Total liabilities       0 0    
Maximum exposure to loss       7,396,000 13,616,000    
2012-1 Automobile Trust [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       5,975,000 12,649,000    
Total liabilities       0 0    
Maximum exposure to loss       5,975,000 12,649,000    
2011 Automobile Trust [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       3,040,000 7,076,000    
Total liabilities       0 0    
Maximum exposure to loss       3,040,000 7,076,000    
Tower Hill Securities [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       66,702,000 87,075,000    
Total liabilities       65,000,000 65,000,000    
Maximum exposure to loss       66,702,000 87,075,000    
Low Income Housing Tax Credit Partnerships [Member]
              
Carrying amount and classification of unconsolidated trusts assets and liabilities              
Total assets       390,639,000 391,878,000    
Total liabilities       144,376,000 152,047,000    
Maximum exposure to loss       $ 390,639,000 $ 391,878,000