Loan Sales And Securitizations (Schedule Of Sensitivity Of Fair Value Of Other Retained Interests To Immediate 10 Percent And 20 Percent Adverse Changes Assumptions) (Details) (USD $) In Thousands, unless otherwise specified				9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2012 Interest Only Strip [Member]	Sep. 30, 2011 Interest Only Strip [Member]	Sep. 30, 2012 Principal Only Strip [Member]		Sep. 30, 2011 Principal Only Strip [Member]
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value of retained interests	$ 1,204,366	$ 988,217	$ 1,227,197	$ 13,739	$ 18,963	$ 5,462		$ 8,585
Weighted average life (in years)				3 years 11 months	3 years 8 months	1 year 11 months	[1]	3 years 11 months
Annual prepayment rate				19.10%	21.00%	49.50%	[1]	30.30%
Annual prepayment rate, Impact on fair value of 10% adverse change				(618)	(917)	(304)	[1]	(266)
Annual prepayment rate, Impact on fair value of 20% adverse change				(1,189)	(1,763)	(640)	[1]	(534)
Annual discount rate on residual cash flows				13.30%	13.20%			22.20%
Annual discount rate on servicing cash flows, Impact on fair value of 10% adverse change				(504)	(697)	(259)	[1]	(394)
Annual discount rate on servicing cash flows, Impact on fair value of 20% adverse change				$ (968)	$ (1,340)	$ (495)	[1]	$ (815)

[1] In third quarter 2012, FHN changed the method used to calculate sensitivities for certificated PO due to more limited market information for these securities.