Loans and Leases and Allowance for Credit Losses (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011		Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Loan and Lease Portfolio
Commercial and industrial	$ 13,938,885		$ 13,938,885		$ 13,063,293		$ 12,424,529
Commercial real estate	5,934,444		5,934,444		6,651,156		6,912,573
Automobile	5,558,415	[1]	5,558,415	[1]	5,614,711	[1]	5,385,196
Home equity	8,078,887		8,078,887		7,713,154		7,689,420
Residential mortgage	4,986,023	[1]	4,986,023	[1]	4,500,366	[1]	4,511,272
Other consumer	515,240	[1]	515,240	[1]	563,827	[1]	577,597
Loans and leases	39,011,894	[2]	39,011,894	[2]	38,106,507	[2]	37,500,587	[2]
Allowance for loan and lease losses	(1,019,710)		(1,019,710)		(1,249,008)		(1,336,352)
Net loans and leases	37,992,184		37,992,184		36,857,499		36,164,235
Portfolio loans purchased during the:
Portfolio loans purchased	59,578		59,578
Portfolio loans sold or transferred to loans held for sale	1,048,563		1,430,925
Non Accrual Loans
Non Accrual loans	565,003		565,003		777,948
Commercial and Industrial [Member]
Loan and Lease Portfolio
Loans and leases	13,938,885		13,938,885		13,063,293
Portfolio loans purchased during the:
Portfolio loans purchased	0		0
Portfolio loans sold or transferred to loans held for sale	48,530		204,012
Non Accrual Loans
Non Accrual loans	209,632		209,632		346,720
Commercial Real Estate [Member]
Loan and Lease Portfolio
Loans and leases	5,934,444		5,934,444		6,651,156
Portfolio loans purchased during the:
Portfolio loans purchased	0		0
Portfolio loans sold or transferred to loans held for sale	0		56,123
Non Accrual Loans
Non Accrual loans	257,086		257,086		363,692
Home Equity [Member]
Loan and Lease Portfolio
Loans and leases	8,078,887		8,078,887		7,713,154
Portfolio loans purchased during the:
Portfolio loans purchased	0		0
Portfolio loans sold or transferred to loans held for sale	0		0
Residential Mortgage [Member]
Portfolio loans purchased during the:
Portfolio loans purchased	0		0
Portfolio loans sold or transferred to loans held for sale	0		170,757
Non Accrual Loans
Non Accrual loans	61,129		61,129		45,010
Commercial and industrial owner occupied [Member]
Loan and Lease Portfolio
Commercial and industrial	3,978,031		3,978,031		3,823,463
Non Accrual Loans
Non Accrual loans	98,998		98,998		138,822
Other commercial and industrial [Member]
Loan and Lease Portfolio
Commercial and industrial	9,960,854		9,960,854		9,239,830
Non Accrual Loans
Non Accrual loans	110,634		110,634		207,898
Commercial real estate retail properties [Member]
Loan and Lease Portfolio
Commercial real estate	1,648,540		1,648,540		1,762,217
Non Accrual Loans
Non Accrual loans	51,342		51,342		96,644
Commercial real estate Multi family [Member]
Loan and Lease Portfolio
Commercial real estate	1,004,314		1,004,314		1,121,616
Non Accrual Loans
Non Accrual loans	38,301		38,301		44,819
Commercial real estate office [Member]
Loan and Lease Portfolio
Commercial real estate	1,011,241		1,011,241		1,123,127
Non Accrual Loans
Non Accrual loans	37,010		37,010		47,950
Commercial real estate Industrial and warehouse [Member]
Loan and Lease Portfolio
Commercial real estate	733,997		733,997		852,952
Non Accrual Loans
Non Accrual loans	49,102		49,102		39,770
Other commercial real estate [Member]
Loan and Lease Portfolio
Commercial real estate	1,536,352		1,536,352		1,791,244
Non Accrual Loans
Non Accrual loans	81,331		81,331		134,509
Automobile Loan [Member]
Portfolio loans purchased during the:
Portfolio loans purchased	59,578	[3]	59,578	[3]
Portfolio loans sold or transferred to loans held for sale	1,000,033		1,000,033
Non Accrual Loans
Non Accrual loans	0		0		0
Home equity secured by first-lien other [Member]
Loan and Lease Portfolio
Home equity	3,588,764	[1]	3,588,764	[1]	3,040,752	[1]
Non Accrual Loans
Non Accrual loans	17,771		17,771		10,658
Home equity Secured by second-lien [Member]
Loan and Lease Portfolio
Home equity	4,490,123	[1]	4,490,123	[1]	4,672,402	[1]
Non Accrual Loans
Non Accrual loans	19,385		19,385		11,868
Other Consumer loan [Member]
Portfolio loans purchased during the:
Portfolio loans purchased	0		0
Portfolio loans sold or transferred to loans held for sale	0		0
Non Accrual Loans
Non Accrual loans	$ 0		$ 0		$ 0

[1] Reflects currently updated customer credit scores.

[2] Amounts represent certain assets and liabilities of a consolidated VIE for which Huntington has elected the fair value option.

[3] Reflected the purchase of $59.6 million of automobile loans as a result of exercising a clean-up call option related to loans previously sold under Huntington's automobile loan sale program.