Mortgage Servicing Rights (Narrative) (Details) (USD $)											3 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2012 Capitalized Msr [Member]	Sep. 30, 2011 Capitalized Msr [Member]	Sep. 30, 2012 Mortgage Loans Serviced For Others [Member]	Sep. 30, 2011 Mortgage Loans Serviced For Others [Member]	Sep. 30, 2012 Transferred To Third Parties [Member]	Sep. 30, 2011 Transferred To Third Parties [Member]	Sep. 30, 2012 Mortgage Banking Income [Member]	Sep. 30, 2011 Mortgage Banking Income [Member]	Sep. 30, 2012 Mortgage Banking Income [Member]	Sep. 30, 2011 Mortgage Banking Income [Member]
Participating Mortgage Loans [Line Items]
Unpaid principal of mortgage loans serviced by FHN					$ 20,000,000,000	$ 25,000,000,000	$ 400,000,000	$ 500,000,000
Servicing, late, and other ancillary fees											13,800,000	16,700,000	46,000,000	56,800,000
Total MSR recognized by FHN	$ 120,537,000	$ 144,069,000	$ 150,803,000	$ 207,319,000			$ 1,700,000	$ 2,800,000	$ 11,600,000	$ 15,800,000