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Fair Value Of Assets And Liabilities (Nonrecurring Fair Value Measurements) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale $ 27,910,000us-gaap_LoansHeldForSaleFairValueDisclosure $ 230,456,000us-gaap_LoansHeldForSaleFairValueDisclosure  
Loans, net of unearned income 16,230,166,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 15,389,074,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 16,708,582,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Real estate acquired by foreclosure 39,922,000us-gaap_RealEstateAcquiredThroughForeclosure 71,562,000us-gaap_RealEstateAcquiredThroughForeclosure  
Other assets 159,753,000us-gaap_OtherAssetsFairValueDisclosure 205,746,000us-gaap_OtherAssetsFairValueDisclosure  
Net gains/(losses), Loans, net of unearned income (714,000)fhn_NetGainsOrLossesLoansNetOfUnearnedIncome [1] (3,109,000)fhn_NetGainsOrLossesLoansNetOfUnearnedIncome [1] (55,948,000)fhn_NetGainsOrLossesLoansNetOfUnearnedIncome [1]
Net gains/(losses), Real estate acquired by foreclosure (3,465,000)fhn_NetGainsOrLossesRealEstateAcquiredByForeclosure [2] (4,987,000)fhn_NetGainsOrLossesRealEstateAcquiredByForeclosure [2] (9,422,000)fhn_NetGainsOrLossesRealEstateAcquiredByForeclosure [2]
Net gains/(losses), Other assets (4,559,000)fhn_NetGainsOrLossesOtherAssets [3] (4,902,000)fhn_NetGainsOrLossesOtherAssets [3] (8,248,000)fhn_NetGainsOrLossesOtherAssets [3]
Gain (loss) on financial assets measured on non-recurring basis (9,162,000)fhn_NetGainsLossOnFinancialAssetsMeasuredOnNonrecurringBasis (12,981,000)fhn_NetGainsLossOnFinancialAssetsMeasuredOnNonrecurringBasis (74,039,000)fhn_NetGainsLossOnFinancialAssetsMeasuredOnNonrecurringBasis
Fair Value Measurements Nonrecurring [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans, net of unearned income 40,531,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 62,839,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 117,064,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1]
Real estate acquired by foreclosure 30,430,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 45,753,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 41,767,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Other assets 63,821,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3] 66,128,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3] 76,501,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3]
Fair Value Inputs Level2 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Other assets 131,743,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 178,846,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Fair Value Inputs Level2 [Member] | Fair Value Measurements Nonrecurring [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans, net of unearned income 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1]
Real estate acquired by foreclosure 0us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 0us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 0us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Other assets 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3] 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3] 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3]
Fair Value Inputs Level3 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 27,910,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 230,456,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Other assets 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Fair Value Inputs Level3 [Member] | Fair Value Measurements Nonrecurring [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans, net of unearned income 40,531,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 62,839,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 117,064,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1]
Real estate acquired by foreclosure 30,430,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 45,753,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 41,767,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Other assets 63,821,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3] 66,128,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3] 76,501,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3]
Fair Value Inputs Level1 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Other assets 28,010,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 26,900,000us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value Inputs Level1 [Member] | Fair Value Measurements Nonrecurring [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans, net of unearned income 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1] 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [1]
Real estate acquired by foreclosure 0us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 0us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 0us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Other assets 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3] 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3] 0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [3]
First Mortgage [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 846,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 9,457,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 12,054,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
Net gains/(losses), Loans held for sale (470,000)fhn_NetGainsOrLossesLoansHeldForSale
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 139,000fhn_NetGainsOrLossesLoansHeldForSale
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 (436,000)fhn_NetGainsOrLossesLoansHeldForSale
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
First Mortgage [Member] | Fair Value Inputs Level2 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
First Mortgage [Member] | Fair Value Inputs Level3 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 846,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 9,457,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 12,054,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
First Mortgage [Member] | Fair Value Inputs Level1 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
Small Business Administrations [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 3,322,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 6,185,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 23,902,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember
Net gains/(losses), Loans held for sale 46,000fhn_NetGainsOrLossesLoansHeldForSale
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 (122,000)fhn_NetGainsOrLossesLoansHeldForSale
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 15,000fhn_NetGainsOrLossesLoansHeldForSale
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember
Small Business Administrations [Member] | Fair Value Inputs Level2 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 3,322,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 6,185,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 23,902,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember
Small Business Administrations [Member] | Fair Value Inputs Level3 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember
Small Business Administrations [Member] | Fair Value Inputs Level1 [Member]      
Fair Value Of Assets And Liabilities [Line Items]      
Loans held-for-sale $ 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 $ 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember		 $ 0us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ fhn_LoansHeldForSaleByTypeAxis
= fhn_SmallBusinessAdministrationsMember
[1]

Represents carrying value of loans for which adjustments are required to be based on the appraised value of the collateral. Write-downs on these loans are recognized as part of provision.
[2]

Represents the fair value and related losses of foreclosed properties that were measured subsequent to their initial classification as foreclosed assets. Balance excludes foreclosed real estate related to government insured mortgages.
[3]

Represents tax credit investments.