Investment Securities (Schedule Of FHN's Available For Sale Securities) (Details) (USD $)	Jun. 30, 2011		Dec. 31, 2010	Jun. 30, 2010
Securities available for sale, Amortized Cost	$ 3,135,438,000	[1]		$ 2,378,217,000	[2]
Securities available for sale, Gross Unrealized Gains	95,039,000	[1]		111,606,000	[2]
Securities available for sale, Gross Unrealized Losses		[1]		(4,000)	[2]
Securities available for sale, Fair Value	3,230,477,000	[1]	3,031,930,000	2,489,819,000	[2]
Pledged available for sale securities	2,900,000,000			2,100,000,000
U.S. Treasuries [Member]
Securities available for sale, Amortized Cost	46,073,000			68,315,000
Securities available for sale, Gross Unrealized Gains	177,000			253,000
Securities available for sale, Gross Unrealized Losses
Securities available for sale, Fair Value	46,250,000			68,568,000
Government Agency Issued Mortgage-Backed Securities MBS [Member]
Securities available for sale, Amortized Cost	1,445,021,000			852,915,000
Securities available for sale, Gross Unrealized Gains	56,746,000			62,686,000
Securities available for sale, Gross Unrealized Losses
Securities available for sale, Fair Value	1,501,767,000			915,601,000
Government Agency Issued Collateralized Mortgage Obligations CMO [Member]
Securities available for sale, Amortized Cost	1,386,962,000			1,054,579,000
Securities available for sale, Gross Unrealized Gains	36,932,000			41,927,000
Securities available for sale, Gross Unrealized Losses
Securities available for sale, Fair Value	1,423,894,000			1,096,506,000
Other U.S. Government Agencies [Member]
Securities available for sale, Amortized Cost	18,791,000			101,355,000
Securities available for sale, Gross Unrealized Gains	1,136,000			6,268,000
Securities available for sale, Gross Unrealized Losses
Securities available for sale, Fair Value	19,927,000			107,623,000
States and Municipalities [Member]
Securities available for sale, Amortized Cost	19,365,000			41,875,000
Securities available for sale, Gross Unrealized Gains
Securities available for sale, Gross Unrealized Losses
Securities available for sale, Fair Value	19,365,000			41,875,000
Equity [Member]
Securities available for sale, Amortized Cost	218,715,000	[3]		258,667,000	[4]
Securities available for sale, Gross Unrealized Gains	19,000	[3]		437,000	[4]
Securities available for sale, Gross Unrealized Losses		[3]		(4,000)	[4]
Securities available for sale, Fair Value	218,734,000	[3]		259,100,000	[4]
Other Debt Securities [Member]
Securities available for sale, Amortized Cost	511,000			511,000
Securities available for sale, Gross Unrealized Gains	29,000			35,000
Securities available for sale, Gross Unrealized Losses
Securities available for sale, Fair Value	540,000			546,000
FHLB-Cincinnati Stock [Member]
Restricted Investments	125,500,000
Reinsurance Contract Agreement [Member]
Restricted Investments				31,200,000
FHN [Member]
Pledged available for sale securities	1,100,000,000			1,300,000,000
FRB [Member]
Restricted Investments	$ 66,100,000			$ 66,200,000

[1] Includes $2.9 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes. As of June 30, 2011, FHN had pledged $1.1 billion of the $2.9 billion pledged available for sale securities as collateral for securities sold under repurchase agreements.

[2] Includes $2.1 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes. As of June 30, 2010, FHN had pledged $1.3 billion of the $2.1 billion pledged available for sale securities as collateral for securities sold under repurchase agreements.

[3] Includes restricted investments in FHLB-Cincinnati stock of $125.5 million and FRB stock of $66.1 million. The remainder is money market, venture capital, and cost method investments.

[4] Includes restricted investments in FHLB-Cincinnati stock of $125.5 million and FRB stock of $66.2 million. The remainder is money market, venture capital, and cost method investments. Additionally, $31.2 million is restricted pursuant to reinsurance contract agreements.