Changes In Accumulated Other Comprehensive Income Balances (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Beginning Balance	$ (188,246,000)		$ (150,009,000)
Other comprehensive income before reclassifications, Net of tax	18,004,000		9,479,000
Amounts reclassifed from accumulated other comprehensive income, Net of tax	1,083,000		411,000
Other comprehensive income/(loss)	19,087,000	[1]	9,890,000	[1]
Ending Balance	(169,159,000)		(140,119,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	700,000		300,000
Unrealized Gain Loss On Securities Available For Sale [Member]
Beginning Balance	18,581,000		(11,241,000)
Other comprehensive income before reclassifications, Net of tax	18,004,000		9,479,000
Amounts reclassifed from accumulated other comprehensive income, Net of tax	0		0
Other comprehensive income/(loss)	18,004,000		9,479,000
Ending Balance	36,585,000		(1,762,000)
Other Comprehensive Income Loss Current Period Before Reclassification Adjustments, Tax	11,300,000		5,900,000
OtherComprehensiveIncomeLossTax	11,300,000		5,900,000
Pension And Other Postretirement Plans Costs [Member]
Beginning Balance	(206,827,000)		(138,768,000)
Other comprehensive income before reclassifications, Net of tax	0		0
Amounts reclassifed from accumulated other comprehensive income, Net of tax	1,083,000		411,000
Other comprehensive income/(loss)	1,083,000		411,000
Ending Balance	(205,744,000)		(138,357,000)
Other Comprehensive Income Loss Current Period Before Reclassification Adjustments, Tax	0		0
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	700,000		300,000
OtherComprehensiveIncomeLossTax	$ 700,000		$ 300,000

[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.