Changes In Accumulated Other Comprehensive Income Balances (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Beginning balance	$ (140,119,000)	$ (151,639,000)	$ (150,009,000)		$ (146,343,000)
Other comprehensive income before reclassifications, Net of tax	17,358,000	(38,800,000)	26,837,000		(45,642,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	650,000	1,774,000	1,061,000		3,320,000
Other comprehensive income/(loss)	18,008,000	(37,026,000)	27,898,000	[1]	(42,322,000)	[1]
Ending balance	(122,111,000)	(188,665,000)	(122,111,000)		(188,665,000)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	400,000	1,100,000	700,000		2,100,000
Unrealized Gain Loss On Securities Available For Sale Member [Member]
Beginning balance	(1,762,000)	48,591,000	(11,241,000)		55,250,000
Other comprehensive income before reclassifications, Net of tax	17,358,000	(39,152,000)	26,837,000		(45,811,000)
Amounts reclassifed from accumulated other comprehensive income, Net of tax	0	0	0		0
Other comprehensive income/(loss)	17,358,000	(39,152,000)	26,837,000		(45,811,000)
Ending balance	15,596,000	9,439,000	15,596,000		9,439,000
Other Comprehensive Income Loss Current Period Before Reclassification Adjustments Tax	10,900,000	(24,500,000)	16,800,000		(28,700,000)
Other Comprehensive Income Loss Tax	10,900,000	(24,500,000)	16,800,000		(28,700,000)
Pension And Postretirement Plans [Member]
Beginning balance	(138,357,000)	(200,230,000)	(138,768,000)		(201,593,000)
Other comprehensive income before reclassifications, Net of tax	0	352,000	0		169,000
Amounts reclassifed from accumulated other comprehensive income, Net of tax	650,000	1,774,000	1,061,000		3,320,000
Other comprehensive income/(loss)	650,000	2,126,000	1,061,000		3,489,000
Ending balance	(137,707,000)	(198,104,000)	(137,707,000)		(198,104,000)
Other Comprehensive Income Loss Current Period Before Reclassification Adjustments Tax	0	200,000	0		100,000
Reclassification From Accumulated Other Comprehensive Income Current Period Tax	400,000	1,100,000	700,000		2,100,000
Other Comprehensive Income Loss Tax	$ 400,000	$ 1,300,000	$ 700,000		$ 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.