Acquisitions And Divestitures (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2011		Dec. 31, 2011
Schedule Of Acquisitions And Divestitures [Line Items]
Number of states, serves customers by subsidiary			40
Goodwill, Impairment	$ 10,100,000	[1],[2]
First Horizon Insurance, Inc. [Member]
Schedule Of Acquisitions And Divestitures [Line Items]
Goodwill, Impairment	10,100,000
Tax benefits recognized	11,100,000
First Horizon Msaver, Inc. [Member]
Schedule Of Acquisitions And Divestitures [Line Items]
Recognized after-tax gains on sales			5,700,000
FHI And Highland Capital Management Corporation [Member]
Schedule Of Acquisitions And Divestitures [Line Items]
Recognized after-tax gains on sales			4,200,000

[1] See Note 16—Restructuring, Repositioning, and Efficiency for further details related to goodwill impairments.

[2] See Note 2—Acquisitions and Divestitures for further details regarding goodwill related to divestitures.