Investment Securities (Schedule Of Amortized Cost And Fair Value by Contractual Maturity) (Details) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010	Jun. 30, 2010
Within 1 year, Amortized Cost	$ 46,073
After 1 year; within 5 years, Amortized Cost	18,791
After 5 years; within 10 years, Amortized Cost	2,795
After 10 years, Amortized Cost	16,570
Securities available for sale, Amortized Cost	84,229
Within 1 year, Fair Value	46,250
After 1 year; within 5 years, Fair Value	19,927
After 5 years; within 10 years, Fair Value	2,795
After 10 years, Fair Value	16,570
Securities available for sale, Fair Value	85,542
Securities available for sale, Amortized Cost	3,135,438	[1]		2,378,217	[2]
Securities available for sale, Fair Value	3,230,477	[1]	3,031,930	2,489,819	[2]
Government Agency Issued MBS and CMO [Member]
Securities available for sale, Amortized Cost	2,831,983
Securities available for sale, Fair Value	2,925,661
Equity and Other Securities [Member]
Securities available for sale, Amortized Cost	219,226
Securities available for sale, Fair Value	$ 219,274

[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.