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Variable Interest Entities (Details 2) (USD $)
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3 Months Ended | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Sep. 30, 2012
|
Sep. 30, 2012
|
Sep. 30, 2012
Unconsolidated Trusts [Member]
|
Dec. 31, 2011
Unconsolidated Trusts [Member]
|
Sep. 30, 2012
Prospect Trust I [Member]
|
Sep. 30, 2012
Sky Financial Capital Trust IV [Member]
|
Sep. 30, 2012
Sky Financial Capital Trust III [Member]
|
Sep. 30, 2012
Sky Financial Capital Trust II [Member]
|
Sep. 30, 2012
Sky Financial Capital Trust I [Member]
|
Sep. 30, 2012
Banc First Ohio Trust Preferred [Member]
|
Sep. 30, 2012
Huntington Capital III [Member]
|
Sep. 30, 2012
Huntington Capital II [Member]
|
Sep. 30, 2012
Huntington Capital I [Member]
|
Sep. 30, 2012
Trust Preferred Securities Total [Member]
|
Dec. 31, 2011
Trust Preferred Securities Total [Member]
|
Sep. 30, 2012
2011 Automobile Trust [Member]
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Dec. 31, 2011
2011 Automobile Trust [Member]
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Sep. 30, 2012
Tower Hill Securities [Member]
|
Dec. 31, 2011
Tower Hill Securities [Member]
|
Sep. 30, 2012
Low Income Housing Tax Credit Partnerships [Member]
|
Dec. 31, 2011
Low Income Housing Tax Credit Partnerships [Member]
|
Sep. 30, 2012
2012 Automobile Trust [Member]
|
Dec. 31, 2011
2012 Automobile Trust [Member]
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| Summary of Outstanding Trust Preferred Securities | |||||||||||||||||||||||||||||||||||||||||||||
| Interest rate on Trust Preferred Securities | 371.00% | [1] | 186.00% | [2] | 186.00% | [2] | 341.00% | [3] | 0.00% | 0.00% | 0.00% | 101.00% | [4] | 115.00% | [5] | ||||||||||||||||||||||||||||||
| Maximum exposure to loss | $ 484,136,000 | $ 479,989,000 | $ 0 | $ 0 | $ 8,462,000 | $ 13,377,000 | $ 89,158,000 | $ 90,514,000 | $ 371,891,000 | $ 376,098,000 | $ 14,625,000 | $ 0 | |||||||||||||||||||||||||||||||||
| Principal amount of subordinated note/ debenture issued to trust | 350,009,000 | 350,009,000 | 6,186,000 | [6] | 74,320,000 | [6] | 72,165,000 | [6] | 30,929,000 | [6] | 0 | [6] | 0 | [6] | 0 | [6] | 54,593,000 | [6] | 111,816,000 | [6] | |||||||||||||||||||||||||
| Investment in unconsolidated subsidiary | 14,879,000 | 14,879,000 | 186,000 | 2,320,000 | 2,165,000 | 929,000 | 0 | 0 | 0 | 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 | 325.00% | 140.00% | 140.00% | 295.00% | 63.00% | 70.00% | |||||||||||||||||||||||||||||||||||||||
| Redemption of trust preferred securities | $ 36,000,000 | $ 194,300,000 | |||||||||||||||||||||||||||||||||||||||||||
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