Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Details)

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Variable Interest Entities (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Mar. 31, 2012
Consolidated Trusts [Member]
Dec. 31, 2011
Consolidated Trusts [Member]
Mar. 31, 2011
Consolidated Trusts [Member]
Mar. 31, 2012
2006 Automobile Trust [Member]
Dec. 31, 2011
2006 Automobile Trust [Member]
Mar. 31, 2011
2006 Automobile Trust [Member]
Mar. 31, 2012
2008 Automboile Trust [Member]
Dec. 31, 2011
2008 Automboile Trust [Member]
Mar. 31, 2011
2008 Automboile Trust [Member]
Mar. 31, 2012
2009 Automobile Trust [Member]
Dec. 31, 2011
2009 Automobile Trust [Member]
Mar. 31, 2011
2009 Automobile Trust [Member]
Mar. 31, 2012
Other Consolidated Trusts [Member]
Dec. 31, 2011
Other Consolidated Trusts [Member]
Mar. 31, 2011
Other Consolidated Trusts [Member]
Mar. 31, 2012
Unconsolidated Trusts [Member]
Dec. 31, 2011
Unconsolidated Trusts [Member]
Mar. 31, 2011
Unconsolidated Trusts [Member]
Mar. 31, 2012
Trust Preferred Securities Total [Member]
Dec. 31, 2011
Trust Preferred Securities Total [Member]
Mar. 31, 2011
Trust Preferred Securities Total [Member]
Sep. 30, 2011
2011 Automobile Trust [Member]
Mar. 31, 2012
2011 Automobile Trust [Member]
Dec. 31, 2011
2011 Automobile Trust [Member]
Mar. 31, 2011
2011 Automobile Trust [Member]
Mar. 31, 2012
Tower Hill Securities [Member]
Dec. 31, 2011
Tower Hill Securities [Member]
Mar. 31, 2011
Tower Hill Securities [Member]
Mar. 31, 2012
Low Income Housing Tax Credit Partnerships [Member]
Dec. 31, 2011
Low Income Housing Tax Credit Partnerships [Member]
Mar. 31, 2011
Low Income Housing Tax Credit Partnerships [Member]
Mar. 31, 2012
2012 Automobile Trust [Member]
Dec. 31, 2011
2012 Automobile Trust [Member]
Mar. 31, 2011
2012 Automobile Trust [Member]
Assets                                                                          
Cash $ 1,111,165,000 $ 1,115,968,000 $ 1,208,820,000 $ 86,553,000 $ 83,259,000 $ 117,502,000 $ 54,521,000 $ 52,325,000 $ 69,902,000 $ 12,854,000 $ 12,722,000 $ 20,876,000 $ 19,178,000 $ 18,212,000 $ 26,724,000 $ 0 $ 0 $ 0                                      
Loans and leases 40,678,542,000 [1],[2] 38,923,783,000 [1] 38,245,836,000 [1] 953,877,000 1,132,158,000 1,761,830,000 601,736,000 704,345,000 1,057,647,000 101,367,000 131,563,000 245,332,000 250,774,000 296,250,000 458,851,000 0 0 0                                      
Allowance for loan and lease losses (913,069,000) (964,828,000) (1,133,226,000) (5,343,000) (7,105,000) (11,336,000) (4,573,000) (5,987,000) (9,202,000) (770,000) (1,118,000) (2,134,000) 0 0 0 0 0 0                                      
Net loans and leases 39,765,473,000 37,958,955,000 37,112,610,000 948,534,000 1,125,053,000 1,750,494,000 597,163,000 698,358,000 1,048,445,000 100,597,000 130,445,000 243,198,000 250,774,000 296,250,000 458,851,000 0 0 0                                      
Accrued income and other assets 2,191,024,000 2,168,149,000 2,171,728,000 4,113,000 6,378,000 13,396,000 2,334,000 2,959,000 4,297,000 427,000 610,000 1,041,000 1,014,000 1,692,000 2,087,000 338,000 1,117,000 5,971,000                                      
Total assets 55,876,654,000 54,450,652,000 52,948,509,000 1,039,200,000 1,214,690,000 1,881,392,000 654,018,000 753,642,000 1,122,644,000 113,878,000 143,777,000 265,115,000 270,966,000 316,154,000 487,662,000 338,000 1,117,000 5,971,000                                      
Liabilities                                                                          
Other long term debt 1,058,167,000 [1] 1,231,517,000 [1] 1,900,555,000 [1] 301,927,000 474,913,000 1,144,328,000 225,236,000 333,644,000 746,421,000 0 18,230,000 103,002,000 76,691,000 123,039,000 294,905,000 0 0 0                                      
Accrued interest and other liabilities 1,204,408,000 1,213,978,000 1,082,665,000 588,000 845,000 6,077,000 56,000 88,000 173,000 0 40,000 214,000 194,000 298,000 590,000 338,000 419,000 5,100,000                                      
Total liabilities 50,326,826,000 49,032,552,000 47,909,910,000 302,515,000 475,758,000 1,150,405,000 225,292,000 333,732,000 746,594,000 0 18,270,000 103,216,000 76,885,000 123,337,000 295,495,000 338,000 419,000 5,100,000                                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                                                                          
Total assets                                     513,903,000 497,353,000 420,511,000 17,364,000 17,364,000 17,519,000   11,578,000 13,377,000 0 89,528,000 90,514,000 89,256,000 376,231,000 376,098,000 313,736,000 19,202,000 0 0
Total liabilities                                     772,128,000 777,250,000 798,829,000 554,417,000 554,496,000 592,542,000   0 0 0 65,000,000 65,000,000 65,000,000 152,711,000 157,754,000 141,287,000 0 0 0
Maximum exposure to loss                                     496,539,000 479,989,000 402,992,000 0 0 0   11,578,000 13,377,000 0 89,528,000 90,514,000 89,256,000 376,231,000 376,098,000 313,736,000 19,202,000 0 0
Variable Interest Entities (Textuals) [Abstract]                                                                          
Maximum year to defer payment of interest on debenture not exceeding five years                                                                        
Commitments to limited partnership interests 376,200,000 376,100,000 313,700,000                                                                    
Funded Commitments to limited partnership interests 334,900,000 322,500,000 259,100,000                                                                    
Total of automobile loans transferred in a securitization transaction                                                 $ 1,000,000,000                   $ 1,300,000,000    
[1] Amounts represent certain assets and liabilities of a consolidated VIE for which Huntington has elected the fair value option.
[2] March 31, 2012, includes $520,564 thousand of loans and leases recorded at fair value acquired in the FDIC-assisted Fidelity Bank acquisition on March 30, 2012.