Mortgage Servicing Rights (Narrative) (Details) (USD $)											3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2012 Capitalized MSR [Member]	Mar. 31, 2011 Capitalized MSR [Member]	Mar. 31, 2012 Mortgage Loans Serviced For Others [Member]	Mar. 31, 2011 Mortgage Loans Serviced For Others [Member]	Mar. 31, 2012 Transferred To Third Parties [Member]	Mar. 31, 2011 Transferred To Third Parties [Member]	Mar. 31, 2012 Mortgage Banking Income [Member]	Mar. 31, 2011 Mortgage Banking Income [Member]
Participating Mortgage Loans [Line Items]
Unpaid principal of mortgage loans serviced by FHN					$ 22,000,000,000	$ 27,000,000,000	$ 400,000,000	$ 600,000,000
Servicing, late, and other ancillary fees											17,200,000	20,800,000
Total MSR recognized by FHN	$ 142,956,000	$ 144,069,000	$ 207,748,000	$ 207,319,000			$ 2,300,000	$ 4,200,000	$ 15,100,000	$ 28,000,000