Components of Other Comprehensive Income/(loss) (Schedule of Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ (170,441)	$ (169,159)	$ (214,192)		$ (188,246)
Net unrealized gains/(losses)	17,637	(20,100)	61,656		(2,096)
Amounts reclassifed from AOCI	470	1,011	202		2,094
Other comprehensive income/(loss)	18,107	(19,089)	61,858	[1]	(2)	[1]
Ending Balance	(152,334)	(188,248)	(152,334)		(188,248)
Securities AFS
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	42,554	36,585	3,394		18,581
Net unrealized gains/(losses)	16,037	(20,100)	56,217		(2,096)
Amounts reclassifed from AOCI	0	0	(1,020)		0
Other comprehensive income/(loss)	16,037	(20,100)	55,197		(2,096)
Ending Balance	58,591	16,485	58,591		16,485
Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	3,465	0	0		0
Net unrealized gains/(losses)	1,600	0	5,439		0
Amounts reclassifed from AOCI	(374)	0	(748)		0
Other comprehensive income/(loss)	1,226	0	4,691		0
Ending Balance	4,691	0	4,691		0
Pension and Postretirement Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(216,460)	(205,744)	(217,586)		(206,827)
Net unrealized gains/(losses)	0	0	0		0
Amounts reclassifed from AOCI	844	1,011	1,970		2,094
Other comprehensive income/(loss)	844	1,011	1,970		2,094
Ending Balance	$ (215,616)	$ (204,733)	$ (215,616)		$ (204,733)

[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.