XML 1154 R120.htm IDEA: XBRL DOCUMENT v2.4.1.9
Pensions, Savings, And Other Employee Benefits (Schedule Of Actuarial Assumptions Used In The Defined Benefit Pension Plan And The Other Employee Benefit Plans)(Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Rate of compensation increase 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease [1] 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease [1] 4.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
Net Periodic Benefit Cost, Rate of compensation increase 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease [1] 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease [1] 4.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Qualified Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Discount rate 4.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionMember		 5.15%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionMember		 4.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionMember
Net Periodic Benefit Cost, Discount rate 5.15%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionMember		 4.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionMember		 5.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionMember
Nonqualified Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Discount rate 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_NonqualifiedPensionMember		 4.70%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_NonqualifiedPensionMember		 3.85%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_NonqualifiedPensionMember
Net Periodic Benefit Cost, Discount rate 4.70%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_NonqualifiedPensionMember		 3.85%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_NonqualifiedPensionMember		 4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_NonqualifiedPensionMember
Other Nonqualified Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Discount rate 3.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_OtherNonqualifiedPensionMember		 4.05%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_OtherNonqualifiedPensionMember		 3.20%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_OtherNonqualifiedPensionMember
Net Periodic Benefit Cost, Discount rate 4.05%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_OtherNonqualifiedPensionMember		 3.20%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_OtherNonqualifiedPensionMember		 4.40%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_OtherNonqualifiedPensionMember
Postretirement Benefit [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Discount rate 4.45%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 5.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 4.55%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Net Periodic Benefit Cost, Discount rate 5.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 4.55%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 5.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Postretirement Benefit [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Discount rate 3.45%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 4.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 3.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Net Periodic Benefit Cost, Discount rate 4.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 3.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PostretirementBenefitCostsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Qualified pension/postretirement benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Expected long-term rate of return 5.85%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionPostretirementBenefitsMember		 6.60%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionPostretirementBenefitsMember		 6.05%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionPostretirementBenefitsMember
Net Periodic Benefit Cost, Expected long-term rate of return 6.60%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionPostretirementBenefitsMember		 6.05%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionPostretirementBenefitsMember		 6.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_QualifiedPensionPostretirementBenefitsMember
Postretirement Benefit Post 1/1/1993 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Expected long-term rate of return 6.35%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPostJanuaryOneNineteenNinetyThreeMember		 6.95%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPostJanuaryOneNineteenNinetyThreeMember		 6.05%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPostJanuaryOneNineteenNinetyThreeMember
Net Periodic Benefit Cost, Expected long-term rate of return 6.95%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPostJanuaryOneNineteenNinetyThreeMember		 6.05%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPostJanuaryOneNineteenNinetyThreeMember		 6.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPostJanuaryOneNineteenNinetyThreeMember
Postretirement Benefit Prior To 1/1/1993 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit Obligations, Expected long-term rate of return 2.30%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPriorToJanuaryOneNineteenNinetyThreeMember		 2.85%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPriorToJanuaryOneNineteenNinetyThreeMember		 3.93%fhn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPriorToJanuaryOneNineteenNinetyThreeMember
Net Periodic Benefit Cost, Expected long-term rate of return 2.85%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPriorToJanuaryOneNineteenNinetyThreeMember		 3.93%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPriorToJanuaryOneNineteenNinetyThreeMember		 4.49%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fhn_PostretirementBenefitPriorToJanuaryOneNineteenNinetyThreeMember
[1]

(a) Due to the pension plan freeze as of December 31, 2012, the rate of compensation increase no longer applies to the qualified pension plan.