Changes In Accumulated Other Comprehensive Income Balances (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Beginning balance	$ (150,009,000)		$ (146,343,000)
Other comprehensive income before reclassifications, Net of tax	9,479,000		(6,842,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	411,000		1,546,000
Net current period other comprehensive income, Net of tax	9,890,000	[1]	(5,296,000)	[1]
Ending balance	(140,119,000)		(151,639,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	300,000		1,000,000
Unrealized Gain Loss On Securities Available For Sale Member [Member]
Beginning balance	(11,241,000)		55,250,000
Other comprehensive income before reclassifications, Net of tax	9,479,000		(6,659,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	0		0
Net current period other comprehensive income, Net of tax	9,479,000		(6,659,000)
Ending balance	(1,762,000)		48,591,000
Other Comprehensive Income Loss Current Period Before Reclassification Adjustments Tax	5,900,000		(4,200,000)
Other Comprehensive Income Loss Tax	5,900,000		(4,200,000)
Pension And Postretirement Plans [Member]
Beginning balance	(138,768,000)		(201,593,000)
Other comprehensive income before reclassifications, Net of tax	0		(183,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	411,000		1,546,000
Net current period other comprehensive income, Net of tax	411,000		1,363,000
Ending balance	(138,357,000)		(200,230,000)
Other Comprehensive Income Loss Current Period Before Reclassification Adjustments Tax	0		(100,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	300,000		1,000,000
Other Comprehensive Income Loss Tax	$ 300,000		$ 900,000

[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.