CONSOLIDATED CONDENSED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands		Total	Preferred Stock	Common Stock		Capital Surplus		Undivided Profits	Accumulated Other Comprehensive Income/(Loss)		Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment to reflect adoption of ASU | Accounting Standards Update 2016-02		$ (1,011)						$ (1,011)
Balance, beginning of period (in shares) at Dec. 31, 2018			1,000	318,573
Balance, beginning of period at Dec. 31, 2018		4,785,380	$ 95,624	$ 199,108		$ 3,029,425		1,542,408	$ (376,616)	[1]	$ 295,431
Beginning balance, as adjusted at Dec. 31, 2018		4,784,369	$ 95,624	$ 199,108		3,029,425		1,541,397	(376,616)	[1]	295,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)		103,405						100,585			2,820
Other comprehensive income/(loss)		55,465							55,465	[1]
Comprehensive income/(loss)		158,870						100,585	55,465	[1]	2,820
Cash dividends declared:
Preferred stock		(1,550)						(1,550)
Common stock		(44,864)						(44,864)
Common stock repurchased (in shares)				(3,594)
Common stock repurchased		(53,436)		$ (2,246)	[2]	(51,190)	[2]
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)				382
Stock options and restricted stock - equity awards		520		$ 239		281
Stock-based compensation expense		5,432				5,432
Dividends declared - noncontrolling interest of subsidiary preferred stock		(2,820)									(2,820)
Balance, ending of period (in shares) at Mar. 31, 2019			1,000	315,361
Balance, end of period at Mar. 31, 2019		4,846,521	$ 95,624	$ 197,101		2,983,948		1,595,568	(321,151)	[1]	295,431
Balance, beginning of period (in shares) at Dec. 31, 2018			1,000	318,573
Balance, beginning of period at Dec. 31, 2018		4,785,380	$ 95,624	$ 199,108		3,029,425		1,542,408	(376,616)	[1]	295,431
Beginning balance, as adjusted at Dec. 31, 2018		4,784,369	$ 95,624	$ 199,108		3,029,425		1,541,397	(376,616)	[1]	295,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)		217,147
Other comprehensive income/(loss)		114,127
Comprehensive income/(loss)		331,274
Cash dividends declared:
Preferred stock		(3,100)
Balance, ending of period (in shares) at Jun. 30, 2019			1,000	312,478
Balance, end of period at Jun. 30, 2019		4,926,081	$ 95,624	$ 195,299		2,941,696		1,660,520	(262,489)	[1]	295,431
Balance, beginning of period (in shares) at Mar. 31, 2019			1,000	315,361
Balance, beginning of period at Mar. 31, 2019		4,846,521	$ 95,624	$ 197,101		2,983,948		1,595,568	(321,151)	[1]	295,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)		113,742						110,890			2,852
Other comprehensive income/(loss)		58,662							58,662	[3]
Comprehensive income/(loss)		172,404						110,890	58,662	[3]	2,852
Cash dividends declared:
Preferred stock		(1,550)						(1,550)
Common stock		(44,388)						(44,388)
Common stock repurchased (in shares)				(3,654)
Common stock repurchased		(52,222)		$ (2,284)	[2]	(49,938)	[2]
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)				771
Stock options and restricted stock - equity awards		2,944		$ 482		2,462
Stock-based compensation expense		5,224				5,224
Dividends declared - noncontrolling interest of subsidiary preferred stock		(2,852)									(2,852)
Balance, ending of period (in shares) at Jun. 30, 2019			1,000	312,478
Balance, end of period at Jun. 30, 2019		4,926,081	$ 95,624	$ 195,299		2,941,696		1,660,520	(262,489)	[1]	295,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment to reflect adoption of ASU | Accounting Standards Update 2016-13		(96,057)						(96,057)
Balance, beginning of period (in shares) at Dec. 31, 2019			1,000	311,469
Balance, beginning of period at Dec. 31, 2019		5,076,008	$ 95,624	$ 194,668		2,931,451		1,798,442	(239,608)	[3]	295,431
Beginning balance, as adjusted at Dec. 31, 2019		4,979,951	$ 95,624	$ 194,668		2,931,451		1,702,385	(239,608)	[3]	295,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)		16,472						13,620			2,852
Other comprehensive income/(loss)		103,444							103,444	[3]
Comprehensive income/(loss)		119,916						13,620	103,444	[3]	2,852
Cash dividends declared:
Preferred stock		(1,550)						(1,550)
Common stock		(47,350)						(47,350)
Common stock repurchased (in shares)				(141)
Common stock repurchased		(2,064)		$ (88)		(1,976)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)				652
Stock options and restricted stock - equity awards		4,140		$ 407		3,733
Stock-based compensation expense		7,281				7,281
Dividends declared - noncontrolling interest of subsidiary preferred stock		(2,852)									(2,852)
Other (in shares)	[4]			(117)
Other	[4]	(1,892)		$ (73)		(1,819)
Balance, ending of period (in shares) at Mar. 31, 2020			1,000	311,863
Balance, end of period at Mar. 31, 2020		5,055,580	$ 95,624	$ 194,914		2,938,670		1,667,105	(136,164)	[3]	295,431
Balance, beginning of period (in shares) at Dec. 31, 2019			1,000	311,469
Balance, beginning of period at Dec. 31, 2019		5,076,008	$ 95,624	$ 194,668		2,931,451		1,798,442	(239,608)	[3]	295,431
Beginning balance, as adjusted at Dec. 31, 2019		4,979,951	$ 95,624	$ 194,668		2,931,451		1,702,385	(239,608)	[3]	295,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)		73,137
Other comprehensive income/(loss)		104,810
Comprehensive income/(loss)		177,947
Cash dividends declared:
Preferred stock		(3,100)
Balance, ending of period (in shares) at Jun. 30, 2020			2,500	312,359
Balance, end of period at Jun. 30, 2020		5,208,385	$ 240,289	$ 195,224		2,940,610		1,671,629	(134,798)	[3]	295,431
Balance, beginning of period (in shares) at Mar. 31, 2020			1,000	311,863
Balance, beginning of period at Mar. 31, 2020		5,055,580	$ 95,624	$ 194,914		2,938,670		1,667,105	(136,164)	[3]	295,431
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)		56,665						53,814			2,851
Other comprehensive income/(loss)		1,366							1,366	[3]
Comprehensive income/(loss)		58,031						53,814	1,366	[3]	2,851
Cash dividends declared:
Preferred stock		(1,550)						(1,550)
Common stock		(47,740)						(47,740)
Preferred stock issuance (in shares) (1,500 shares issued at $100,000 per share net of offering costs)			1,500
Preferred stock issuance (1,500 shares issued at $100,000 per share net of offering costs)		144,665	$ 144,665
Common stock repurchased (in shares)				(183)
Common stock repurchased		(1,468)		$ (114)		(1,354)
Common stock issued for:
Stock options and restricted stock - equity awards (in shares)				679
Stock options and restricted stock - equity awards				$ 424		(424)
Stock-based compensation expense		3,718				3,718
Dividends declared - noncontrolling interest of subsidiary preferred stock		(2,851)									(2,851)
Balance, ending of period (in shares) at Jun. 30, 2020			2,500	312,359
Balance, end of period at Jun. 30, 2020		$ 5,208,385	$ 240,289	$ 195,224		$ 2,940,610		$ 1,671,629	$ (134,798)	[3]	$ 295,431

[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.

[2] Includes $51.5 million and $50.2 million repurchased under share repurchase programs in first and second quarter 2019, respectively.

[3] 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.

[4] Represents shares canceled in connection with the resolution of remaining Capital Bank Financial Corporation ("CBF") dissenters' appraisal process.