Available-for-Sale and Other Securities (Details 5) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Unrealized OTTI recognized in OCI on debt securities held by Huntington
Balance, beginning of period	$ 85,397	$ 118,330	$ 100,838	$ 124,408
Reductions from sales	0	(9,223)	(1,053)	(9,223)
Credit losses not previous recognized	0	675	0	9,584
Change in expected cash flows	(425)	(27,997)	(16,466)	(45,657)
Additional credit losses	4,787	6,053	6,440	8,726
Balance, end of period	89,759	87,838	89,759	87,838
OTTI recognized in earnings on debt securities held by Huntington
Balance, beginning of period	54,402	58,612	54,536	53,801
Reductions from sales	0	(7,845)	(4,481)	(12,319)
Credit losses not previous recognized	26	99	26	1,656
Additional credit losses	1,338	2,618	5,685	10,346
Balance, end of period	$ 55,766	$ 53,484	$ 55,766	$ 53,484

Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Rollforward.

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Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Rollforward Additions Additional Credit Losses.

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Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Rollforward Additions No Previous Impairment.

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Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Rollforward Credit Losses On Debt Securities Held.

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Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Rollforward Reductions Securities Sold.

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Other Than Temporary Impairment Credit Losses Recognized In Other Comprehensive Income Loss Credit Losses On Debt Securities Held.

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This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.

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This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

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This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held due to increases in cash flows expected to be collected and recognized over the remaining life of the security.

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This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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