Changes In Accumulated Other Comprehensive Income Balances (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Beginning balance	$ (188,665,000)		$ (146,343,000)
Other comprehensive income before reclassifications, Net of tax	1,714,000		(43,928,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	10,560,000		13,880,000
Net current period other comprehensive income, Net of tax	12,274,000	5,898,000	(30,048,000)	[1]	13,472,000	[1]
Ending balance	(176,391,000)	(116,684,000)	(176,391,000)		(116,684,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	6,600,000		8,700,000
Unrealized Gain Loss On Securities Available For Sale [Member]
Beginning balance	9,439,000		55,250,000
Other comprehensive income before reclassifications, Net of tax	1,714,000		(44,097,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	0		0
Net current period other comprehensive income, Net of tax	1,714,000		(44,097,000)
Ending balance	11,153,000		11,153,000
Other Comprehensive Income Loss Current Period Before Reclassification Adjustments Tax	1,100,000		(27,600,000)
Other Comprehensive Income Loss Tax	1,100,000		(27,600,000)
Pension And Postretirement Plans [Member]
Beginning balance	(198,104,000)		(201,593,000)
Other comprehensive income before reclassifications, Net of tax	0		169,000
Amounts reclassifed from accumulated other comprehensive income, Net of tax	10,560,000		13,880,000
Net current period other comprehensive income, Net of tax	10,560,000		14,049,000
Ending balance	(187,544,000)		(187,544,000)
Other Comprehensive Income Loss Current Period Before Reclassification Adjustments Tax	0		100,000
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	6,600,000		8,700,000
Other Comprehensive Income Loss Tax	$ 6,600,000		$ 8,800,000

[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.