Loan Sales and Securitizations (Schedule of Principal Amount of Delinquent Loans, and Net Credit Losses) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal amount of loans securitized and sold	$ 4,800,000,000		$ 6,900,000,000		$ 4,800,000,000		$ 6,900,000,000
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal Amount of Residential Real Estate Loans	13,691,924,000	[1],[2],[3]	16,616,012,000	[1],[2],[3]	13,691,924,000	[1],[2],[3]	16,616,012,000	[1],[2],[3]
Net Credit Losses	78,055,000	[2]	112,398,000	[2]	140,682,000	[2]	228,884,000	[2]
Principal Amount90 Days Or More Past Due Or Nonaccrual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal Amount of Residential Real Estate Loans	700,000,000		700,000,000		700,000,000		700,000,000
Principal Amount90 Days Or More Past Due Or Nonaccrual [Member] | Government National Mortgage Association Certificates And Obligations G N M A [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Principal Amount of Residential Real Estate Loans	$ 38,100,000		$ 38,800,000		$ 38,100,000		$ 38,800,000

[1] On June 30, 2013 and 2012, includes $.7 billion where the principal amount is 90 days or more past due or nonaccrual. Included in these amounts are $38.1 million and $38.8 million of GNMA guaranteed mortgages on June 30, 2013 and 2012, respectively.

[2] 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 10 - Contingencies and Other Disclosures for discussion related to repurchase obligations for loans transferred to GSEs or private investors.

[3] 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 $4.8 billion and $6.9 billion of loans transferred to GSEs with any type of retained interest on June 30, 2013 and 2012, respectively.