Pension, Savings, And Other Employee Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Estimated social security benefits age		65 years
First Horizon National Corporation | Expected reduction to interest cost in 2016 [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost		$ (5.8)
Non Qualified Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to non-qualified plans				$ 4.9
Expected pension contribution				$ 5.2
Savings Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer investment in qualified defined contribution plan		100.00%	100.00%
Maximum percent of employee pre-tax contributions that may be matched by the Company		6.00%	6.00%
Pension Benefits [Member] | First Horizon National Corporation | Expected reduction to interest cost in 2016 [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected pension contribution	$ 165.0