Loan Sales And Securitizations (Schedule Of Principal Amount Of Delinquent Loans, And Net Credit Losses) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal amount of loans securitized and sold	$ 7,500,000,000		$ 9,400,000,000
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal Amount of Residential Real Estate Loans	17,396,233,000	[1],[2],[3]	20,437,618,000	[1],[2],[3]
Net Credit Losses	116,486,000	[3]	128,349,000	[3]
Principal Amount 90 Days Or More Past Due Or Nonaccrual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal Amount of Residential Real Estate Loans	800,000,000		900,000,000
Principal Amount 90 Days Or More Past Due Or Nonaccrual [Member] | Government National Mortgage Association Certificates And Obligations (GNMA) [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal Amount of Residential Real Estate Loans	$ 40,000,000		$ 37,900,000

[1] Amounts represent real estate residential loans in FHN's portfolio, held-for-sale, and loans that have been transferred in proprietary securitizations and whole loan sales in which FHN has a retained interest other than servicing rights. Also includes $7.5 billion and $9.4 billion of loans transferred to GSEs with any type of retained interest on March 31, 2012 and 2011, respectively.

[2] On March 31, 2012 and 2011, includes $.8 billion and $.9 billion, respectively, where the principal amount is 90 days or more past due, or nonaccrual. Included in these amounts are $40.0 million and $37.9 million of GNMA guaranteed mortgages on March 31, 2012 and 2011, respectively.

[3] No delinquency or net credit loss data is provided for the loans transferred to FNMA or FHLMC because these agencies retain credit risk. See Note 9—Contingencies and Other Disclosures for discussion related to repurchase obligations for loans transferred to GSE's or private investors.