Mortgage Servicing Rights (Narrative) (Details) (USD $)											3 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2012 Capitalized MSR [Member]	Jun. 30, 2011 Capitalized MSR [Member]	Jun. 30, 2012 Mortgage Loans Serviced For Others [Member]	Jun. 30, 2011 Mortgage Loans Serviced For Others [Member]	Jun. 30, 2012 Transferred To Third Parties [Member]	Jun. 30, 2011 Transferred To Third Parties [Member]	Jun. 30, 2012 Mortgage Banking Income [Member]	Jun. 30, 2011 Mortgage Banking Income [Member]	Jun. 30, 2012 Mortgage Banking Income [Member]	Jun. 30, 2011 Mortgage Banking Income [Member]
Participating Mortgage Loans [Line Items]
Unpaid principal of mortgage loans serviced by FHN					$ 21,000,000,000	$ 26,000,000,000	$ 400,000,000	$ 500,000,000
Servicing, late, and other ancillary fees											15,000,000	19,200,000	32,200,000	40,100,000
Total MSR recognized by FHN	$ 129,291,000	$ 144,069,000	$ 186,958,000	$ 207,319,000			$ 1,900,000	$ 3,600,000	$ 12,400,000	$ 23,600,000