Changes In Accumulated Other Comprehensive Income Balances (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Beginning balance	$ (151,639,000)		$ (146,343,000)
Other comprehensive income before reclassifications, Net of tax	(38,800,000)		(45,642,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	1,774,000		3,320,000
Net current period other comprehensive income, Net of tax	(37,026,000)	2,031,000	(42,322,000)	[1]	7,574,000	[1]
Ending balance	(188,665,000)	(122,583,000)	(188,665,000)		(122,583,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	1,100,000		2,100,000
Unrealized Gain Loss On Securities Available For Sale [Member]
Beginning balance	48,591,000		55,250,000
Other comprehensive income before reclassifications, Net of tax	(39,152,000)		(45,811,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	0		0
Net current period other comprehensive income, Net of tax	(39,152,000)		(45,811,000)
Ending balance	9,439,000		9,439,000
Other comprehensive income before reclassficiations, Net of tax	(24,500,000)		(28,700,000)
Other Comprehensive Income Loss Tax	(24,500,000)		(28,700,000)
Pension And Postretirement Plans [Member]
Beginning balance	(200,230,000)		(201,593,000)
Other comprehensive income before reclassifications, Net of tax	352,000		169,000
Amounts reclassifed from accumulated other comprehensive income, Net of tax	1,774,000		3,320,000
Net current period other comprehensive income, Net of tax	2,126,000		3,489,000
Ending balance	(198,104,000)		(198,104,000)
Other comprehensive income before reclassficiations, Net of tax	200,000		100,000
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	1,100,000		2,100,000
Other Comprehensive Income Loss Tax	$ 1,300,000		$ 2,200,000

[1] Due to the nature of the preferred stock issued by FHN and its subsidiaries, all components of Other comprehensive income/(loss) have been attributed solely to FHN as the controlling interest holder.