Mortgage Servicing Rights (Narrative) (Details) (USD $)					3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009	Sep. 30, 2011 Mortgage Banking Income [Member]	Sep. 30, 2010 Mortgage Banking Income [Member]	Sep. 30, 2011 Mortgage Banking Income [Member]	Sep. 30, 2010 Mortgage Banking Income [Member]	Sep. 30, 2011 Other Income And Commissions [Member]	Sep. 30, 2010 Other Income And Commissions [Member]	Sep. 30, 2011 Other Income And Commissions [Member]	Sep. 30, 2010 Other Income And Commissions [Member]	Sep. 30, 2011 Capitalized MSR [Member]	Sep. 30, 2011 Mortgage Loans Serviced For Others [Member]	Sep. 30, 2010 Mortgage Loans Serviced For Others [Member]	Sep. 30, 2011 Transferred To Third Parties [Member]	Sep. 30, 2010 Transferred To Third Parties [Member]
Participating Mortgage Loans [Line Items]
Unpaid principal of mortgage loans serviced by FHN													$ 24,900,000,000	$ 500,000,000	$ 700,000,000
Servicing, late, and other ancillary fees					16,700,000	21,400,000	56,800,000	75,000,000	600,000	900,000	1,800,000	3,100,000
Total MSR recognized by FHN	$ 150,803,000	$ 207,319,000	$ 191,943,000	$ 302,611,000										$ 2,800,000	$ 4,100,000	$ 15,800,000	$ 21,800,000