Business Segment Information (Amounts Of Consolidated Revenue, Expense, Tax And Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 number		Mar. 31, 2013
Segment Reporting Information [Line Items]
Net interest income	$ 152,359		$ 161,382
Provision/(provision credit) for loan losses	10,000		15,000
Noninterest income	145,730		156,427
Noninterest expense	220,214		240,540
Income/(loss) before income taxes	67,875		62,269
Provision/(benefit) for income taxes	18,645		17,730
Income/(loss) from continuing operations	49,230		44,539
Income/(loss) from discontinued operations, net of tax	0	[1]	430	[1]
Net income/(loss)	49,230		44,969
Average assets	23,916,069		25,044,547
Number of Operating Segments	4
Regional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	142,010		147,120
Provision/(provision credit) for loan losses	12,990		(2,485)
Noninterest income	59,992		59,144
Noninterest expense	133,050		131,077
Income/(loss) before income taxes	55,962		77,672
Provision/(benefit) for income taxes	19,880		28,221
Net income/(loss)	36,082		49,451
Average assets	12,617,386		12,957,581
Capital Markets [Member]
Segment Reporting Information [Line Items]
Net interest income	3,478		3,968
Noninterest income	56,758		76,612
Noninterest expense	52,594		61,533
Income/(loss) before income taxes	7,642		19,047
Provision/(benefit) for income taxes	2,845		7,222
Net income/(loss)	4,797		11,825
Average assets	2,037,850		2,457,779
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income	(9,113)		(10,059)
Noninterest income	13,215		7,855
Noninterest expense	19,578		17,613
Income/(loss) before income taxes	(15,476)		(19,817)
Provision/(benefit) for income taxes	(11,766)		(12,083)
Net income/(loss)	(3,710)		(7,734)
Average assets	5,856,661		5,254,472
Non Strategic [Member]
Segment Reporting Information [Line Items]
Net interest income	15,984		20,353
Provision/(provision credit) for loan losses	(2,990)		17,485
Noninterest income	15,765		12,816
Noninterest expense	14,992		30,317
Income/(loss) before income taxes	19,747		(14,633)
Provision/(benefit) for income taxes	7,686		(5,630)
Income/(loss) from continuing operations	12,061		(9,003)
Income/(loss) from discontinued operations, net of tax	0		430
Net income/(loss)	12,061		(8,573)
Average assets	$ 3,404,172		$ 4,374,715

[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.