Acquisitions And Divestitures (Details) (USD $)	9 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011		Mar. 31, 2011 First Horizon Insurance Inc [Member]	Sep. 30, 2011 First Horizon Insurance Inc [Member]	Dec. 31, 2011 First Horizon Insurance Inc [Member] number	Dec. 31, 2011 First Horizon Msaver Inc [Member]	Dec. 31, 2011 First Horizon Insurance And Highland Capital Management Corporation [Member]
Schedule Of Acquisitions And Divestitures [Line Items]
Recognized after-tax gains on sales		$ 9,900,000					$ 5,700,000	$ 4,200,000
Number of states, serves customers by subsidiary						40
Goodwill, Impairment	0	10,100,000	[1],[2]	10,100,000	10,100,000
Tax benefits recognized				$ 11,100,000

[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.