Business Segment Information (Amounts Of Consolidated Revenue, Expense, Tax And Assets) (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014 number		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]
Net interest income	$ 159,541,000		$ 158,838,000		$ 468,668,000		$ 480,239,000
Provision/(provision credit) for loan losses	6,000,000		10,000,000		21,000,000		40,000,000
Noninterest income	157,815,000		150,475,000		430,446,000		449,534,000
Noninterest expense	246,186,000		433,556,000		631,732,000		901,504,000
Income/(loss) before income taxes	65,170,000		(134,243,000)		246,382,000		(11,731,000)
Provision/(benefit) for income taxes	15,421,000		(31,094,000)		66,223,000		1,644,000
Income/(loss) from continuing operations	49,749,000		(103,149,000)		180,159,000		(13,375,000)
Income/(loss) from discontinued operations, net of tax	0	[1]	123,000	[1]	0	[1]	554,000	[1]
Net income/(loss)	49,749,000		(103,026,000)		180,159,000		(12,821,000)
Average assets	23,804,957,000		24,181,633,000		23,790,586,000		24,599,839,000
Number of Operating Segments	4
Regional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	153,855,000		149,541,000		444,519,000		444,881,000
Provision/(provision credit) for loan losses	2,204,000		5,159,000		23,619,000		15,875,000
Noninterest income	64,159,000		63,883,000		190,377,000		184,912,000
Noninterest expense	136,253,000		131,961,000		402,867,000		392,622,000
Income/(loss) before income taxes	79,557,000		76,304,000		208,410,000		221,296,000
Provision/(benefit) for income taxes	28,422,000		27,554,000		74,145,000		79,921,000
Net income/(loss)	51,135,000		48,750,000		134,265,000		141,375,000
Average assets	13,577,560,000		12,923,245,000		13,086,901,000		12,940,127,000
Capital Markets [Member]
Segment Reporting Information [Line Items]
Net interest income	2,952,000		3,811,000		9,020,000		11,876,000
Noninterest income	49,895,000		64,115,000		154,217,000		208,926,000
Noninterest expense	47,910,000		57,930,000		100,615,000		179,285,000
Income/(loss) before income taxes	4,937,000		9,996,000		62,622,000		41,517,000
Provision/(benefit) for income taxes	1,697,000		3,765,000		23,688,000		15,638,000
Net income/(loss)	3,240,000		6,231,000		38,934,000		25,879,000
Average assets	2,002,913,000		2,104,991,000		2,038,136,000		2,322,060,000
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income	(12,523,000)		(11,654,000)		(32,158,000)		(32,895,000)
Noninterest income	4,139,000		6,558,000		22,568,000		18,224,000
Noninterest expense	18,783,000		21,739,000		54,159,000		56,493,000
Income/(loss) before income taxes	(27,167,000)		(26,835,000)		(63,749,000)		(71,164,000)
Provision/(benefit) for income taxes	(17,723,000)		(16,593,000)		(46,759,000)		(44,374,000)
Net income/(loss)	(9,444,000)		(10,242,000)		(16,990,000)		(26,790,000)
Average assets	5,229,804,000		5,166,494,000		5,474,810,000		5,162,989,000
Non Strategic [Member]
Segment Reporting Information [Line Items]
Net interest income	15,257,000		17,140,000		47,287,000		56,377,000
Provision/(provision credit) for loan losses	3,796,000		4,841,000		(2,619,000)		24,125,000
Noninterest income	39,622,000		15,919,000		63,284,000		37,472,000
Noninterest expense	43,240,000		221,926,000		74,091,000		273,104,000
Income/(loss) before income taxes	7,843,000		(193,708,000)		39,099,000		(203,380,000)
Provision/(benefit) for income taxes	3,025,000		(45,820,000)		15,149,000		(49,541,000)
Income/(loss) from continuing operations	4,818,000		(147,888,000)		23,950,000		(153,839,000)
Income/(loss) from discontinued operations, net of tax	0		123,000		0		554,000
Net income/(loss)	4,818,000		(147,765,000)		23,950,000		(153,285,000)
Average assets	$ 2,994,680,000		$ 3,986,903,000		$ 3,190,739,000		$ 4,174,663,000

[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.