Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Details 2)

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Variable Interest Entities (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Unconsolidated Trusts [Member]
Dec. 31, 2012
Unconsolidated Trusts [Member]
Sep. 30, 2013
Sky Financial Capital Trust IV [Member]
Sep. 30, 2013
Sky Financial Capital Trust III [Member]
Sep. 30, 2013
Huntington Capital II [Member]
Sep. 30, 2013
Huntington Capital I [Member]
Sep. 30, 2013
Trust Preferred Securities Total [Member]
Dec. 31, 2012
Trust Preferred Securities Total [Member]
Sep. 30, 2013
2011 Automobile Trust [Member]
Dec. 31, 2012
2011 Automobile Trust [Member]
Sep. 30, 2013
Tower Hill Securities [Member]
Dec. 31, 2012
Tower Hill Securities [Member]
Sep. 30, 2013
Low Income Housing Tax Credit Partnerships [Member]
Dec. 31, 2012
Low Income Housing Tax Credit Partnerships [Member]
Sep. 30, 2013
2012-1 Automobile Trust [Member]
Dec. 31, 2012
2012-1 Automobile Trust [Member]
Sep. 30, 2013
2012-2 Automobile Trust [Member]
Dec. 31, 2012
2012-2 Automobile Trust [Member]
Summary of Outstanding Trust Preferred Securities                                      
Interest rate on Trust Preferred Securities       1.67% [1] 1.65% [1] 0.88% [2] 0.97% [3]                        
Maximum exposure to loss   $ 467,004 $ 512,294         $ 0 $ 0 $ 3,827 $ 7,076 $ 79,312 $ 87,075 $ 367,817 $ 391,878 $ 7,298 $ 12,649 $ 8,750 $ 13,616
Principal amount of subordinated note/ debenture issued to trust 312,894     74,320 [4] 72,165 [4] 54,593 [4] 111,816 [4]                        
Investment in unconsolidated subsidiary $ 13,764     $ 2,320 $ 2,165 $ 3,093 $ 6,186                        
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]                                      
Variable rate basis three month LIBOR                                    
Rate spread over three month LIBOR       1.40% 1.40% 0.63% 0.70%                        
[1] Variable effective rate at September 30, 2013, based on three month LIBOR + 1.40.
[2] Variable effective rate at September 30, 2013, based on three month LIBOR + 0.625.
[3] Variable effective rate at September 30, 2013, based on three month LIBOR + 0.70.
[4] Represents the principal amount of debentures issued to each trust, including unamortized original issue discount.