Business Segment Information (Amounts Of Consolidated Revenue, Expense, Tax And Assets) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014 number		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Segment Reporting Information [Line Items]
Net interest income	$ 156,768,000		$ 160,019,000		$ 309,127,000		$ 321,401,000
Provision/(provision credit) for loan losses	5,000,000		15,000,000		15,000,000		30,000,000
Noninterest income	126,901,000		142,632,000		272,631,000		299,059,000
Noninterest expense	165,332,000		227,408,000		385,546,000		467,948,000
Income/(loss) before income taxes	113,337,000		60,243,000		181,212,000		122,512,000
Provision/(benefit) for income taxes	32,157,000		15,008,000		50,802,000		32,738,000
Income/(loss) from continuing operations	81,180,000		45,235,000		130,410,000		89,774,000
Income/(loss) from discontinued operations, net of tax	0	[1]	1,000	[1]	0	[1]	431,000	[1]
Net income/(loss)	81,180,000		45,236,000		130,410,000		90,205,000
Average assets	23,651,952,000		24,582,818,000		23,783,281,000		24,812,407,000
Number of Operating Segments	4
Sentinel Litigation [Member] | Insurance Settlement
Segment Reporting Information [Line Items]
Gain Loss Related To Litigation Settlement	47,100,000				47,100,000
Regional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	148,654,000		148,220,000		290,664,000		295,340,000
Provision/(provision credit) for loan losses	8,425,000		13,201,000		21,415,000		10,716,000
Noninterest income	66,226,000		61,885,000		126,218,000		121,029,000
Noninterest expense	133,564,000		129,584,000		266,614,000		260,661,000
Income/(loss) before income taxes	72,891,000		67,320,000		128,853,000		144,992,000
Provision/(benefit) for income taxes	25,843,000		24,146,000		45,723,000		52,367,000
Net income/(loss)	47,048,000		43,174,000		83,130,000		92,625,000
Average assets	13,055,204,000		12,939,928,000		12,837,505,000		12,948,706,000
Capital Markets [Member]
Segment Reporting Information [Line Items]
Net interest income	2,590,000		4,097,000		6,068,000		8,065,000
Noninterest income	47,564,000		68,199,000		104,322,000		144,811,000
Noninterest expense	111,000	[2]	59,822,000		52,705,000	[2]	121,355,000
Income/(loss) before income taxes	50,043,000		12,474,000		57,685,000		31,521,000
Provision/(benefit) for income taxes	19,146,000		4,651,000		21,991,000		11,873,000
Net income/(loss)	30,897,000		7,823,000		35,694,000		19,648,000
Average assets	2,074,028,000		2,407,287,000		2,056,039,000		2,432,394,000
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income	(10,522,000)		(11,182,000)		(19,635,000)		(21,241,000)
Noninterest income	5,214,000		3,811,000		18,429,000		11,666,000
Noninterest expense	15,798,000		17,141,000		35,376,000		34,754,000
Income/(loss) before income taxes	(21,106,000)		(24,512,000)		(36,582,000)		(44,329,000)
Provision/(benefit) for income taxes	(17,270,000)		(15,698,000)		(29,036,000)		(27,781,000)
Net income/(loss)	(3,836,000)		(8,814,000)		(7,546,000)		(16,548,000)
Average assets	5,344,855,000		5,068,970,000		5,599,344,000		5,161,208,000
Non Strategic [Member]
Segment Reporting Information [Line Items]
Net interest income	16,046,000		18,884,000		32,030,000		39,237,000
Provision/(provision credit) for loan losses	(3,425,000)		1,799,000		(6,415,000)		19,284,000
Noninterest income	7,897,000		8,737,000		23,662,000		21,553,000
Noninterest expense	15,859,000		20,861,000		30,851,000		51,178,000
Income/(loss) before income taxes	11,509,000		4,961,000		31,256,000		(9,672,000)
Provision/(benefit) for income taxes	4,438,000		1,909,000		12,124,000		(3,721,000)
Income/(loss) from continuing operations	7,071,000		3,052,000		19,132,000		(5,951,000)
Income/(loss) from discontinued operations, net of tax	0		1,000		0		431,000
Net income/(loss)	7,071,000		3,053,000		19,132,000		(5,520,000)
Average assets	$ 3,177,865,000		$ 4,166,633,000		$ 3,290,393,000		$ 4,270,099,000

[1] Due to the nature of the preferred stock issued by FHN and its subsidiaries, all components of Income/(loss) from discontinued operations, net of tax have been attributed solely to FHN as the controlling interest holder.

[2] Three and six months ended June 30, 2014, includes $47.1 million related to agreements with insurance companies for the recovery of litigation and legal expenses FHN incurred in connection with the Sentinel litigation matter which was settled in 2011