Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Details 2)

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Variable Interest Entities (Details 2) (USD $)
3 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Unconsolidated Trusts [Member]
Dec. 31, 2011
Unconsolidated Trusts [Member]
Jun. 30, 2012
Prospect Trust I [Member]
Jun. 30, 2012
Sky Financial Capital Trust IV [Member]
Jun. 30, 2012
Sky Financial Capital Trust III [Member]
Jun. 30, 2012
Sky Financial Capital Trust II [Member]
Jun. 30, 2012
Sky Financial Capital Trust I [Member]
Jun. 30, 2012
Banc First Ohio Trust Preferred [Member]
Jun. 30, 2012
Huntington Capital III [Member]
Jun. 30, 2012
Huntington Capital II [Member]
Jun. 30, 2012
Huntington Capital I [Member]
Jun. 30, 2012
Trust Preferred Securities Total [Member]
Dec. 31, 2011
Trust Preferred Securities Total [Member]
Jun. 30, 2012
2011 Automobile Trust [Member]
Dec. 31, 2011
2011 Automobile Trust [Member]
Jun. 30, 2012
Tower Hill Securities [Member]
Dec. 31, 2011
Tower Hill Securities [Member]
Jun. 30, 2012
Low Income Housing Tax Credit Partnerships [Member]
Dec. 31, 2011
Low Income Housing Tax Credit Partnerships [Member]
Jun. 30, 2012
2012 Automobile Trust [Member]
Dec. 31, 2011
2012 Automobile Trust [Member]
Summary of Outstanding Trust Preferred Securities                                            
Interest rate on Trust Preferred Securities       3.72% [1] 1.87% [2] 1.87% [2] 3.42% [3] 0.00% 0.00% 6.85% 1.09% [4] 1.45% [5]                    
Maximum exposure to loss   $ 473,854,000 $ 479,989,000                   $ 0 $ 0 $ 9,933,000 $ 13,377,000 $ 89,100,000 $ 90,514,000 $ 358,017,000 $ 376,098,000 $ 16,804,000 $ 0
Principal amount of subordinated note/ debenture issued to trust 464,125,000     6,186,000 [6] 74,320,000 [6] 72,165,000 [6] 30,929,000 [6] 0 [6] 0 [6] 114,116,000 [6] 54,593,000 [6] 111,816,000 [6]                    
Investment in unconsolidated subsidiary 14,889,000     186,000 2,320,000 2,165,000 929,000 0 0 10,000 3,093,000 6,186,000                    
Summary of Outstanding Trust Preferred Securities (Textuals) [Abstract]                                            
Variable rate basis 3 month LIBOR                                          
Rate spread over three month LIBOR       3.25% 1.40% 1.40% 2.95%       0.63% 0.70%                    
Redemption of trust preferred securities $ 80,000,000                                          
[1] Variable effective rate at June 30, 2012, based on three month LIBOR + 3.25.
[2] Variable effective rate at June 30, 2012, based on three month LIBOR + 1.40.
[3] Variable effective rate at June 30, 2012, based on three month LIBOR + 2.95.
[4] Variable effective rate at June 30, 2012, based on three month LIBOR + 0.625.
[5] Variable effective rate at June 30, 2012, based on three month LIBOR + 0.70.
[6] Represents the principal amount of debentures issued to each trust, including unamortized original issue discount.