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Investment Securities (Schedule Of FHN's Investment Securities) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost $ 3,526,482,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [1] $ 3,416,283,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [2]
Securities available for sale, Gross Unrealized Gains 57,365,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains [1] 44,876,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains [2]
Securities available for sale, Gross Unrealized Losses (27,234,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss [1] (62,702,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss [2]
Securities available for sale 3,556,613,000us-gaap_AvailableForSaleSecurities [1] 3,398,457,000us-gaap_AvailableForSaleSecurities [2]
Pledged available for sale securities 3,300,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral 3,100,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Schedule Of Held To Maturity Securities [Line Items]    
Securities held to maturity, Amortized cost 4,292,000us-gaap_HeldToMaturitySecurities 0us-gaap_HeldToMaturitySecurities
Securities held to maturity, Gross Unrealized Gains 1,112,000us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains  
Securities held to maturity, Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses  
Securities held to maturity, Fair Value 5,404,000us-gaap_HeldToMaturitySecuritiesFairValue  
U S States And Political Subdivisions [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Securities held to maturity, Amortized cost 4,292,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Securities held to maturity, Gross Unrealized Gains 1,112,000us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Securities held to maturity, Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Securities held to maturity, Fair Value 5,404,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
FHN [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale 2,634,000us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 1,643,000us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
FRB [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Restricted investments 66,000,000us-gaap_RestrictedInvestments
/ dei_LegalEntityAxis
= fhn_FrbMember		 66,000,000us-gaap_RestrictedInvestments
/ dei_LegalEntityAxis
= fhn_FrbMember
FHLB-Cincinnati Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Restricted investments 87,900,000us-gaap_RestrictedInvestments
/ dei_LegalEntityAxis
= fhn_FhlbCincinnatiStockMember		 128,000,000us-gaap_RestrictedInvestments
/ dei_LegalEntityAxis
= fhn_FhlbCincinnatiStockMember
U.S. treasuries    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 100,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 39,997,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Securities available for sale, Gross Unrealized Gains 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Securities available for sale, Gross Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 (1,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Securities available for sale 100,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 39,996,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Government Agency Issued Mortgage-Backed Securities ("MBS")    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 716,618,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 796,835,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available for sale, Gross Unrealized Gains 35,287,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 32,353,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available for sale, Gross Unrealized Losses (740,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 (5,499,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available for sale 751,165,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 823,689,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Government Agency Issued Collateralized Mortgage Obligations ("CMO")    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 2,615,620,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 2,335,718,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Securities available for sale, Gross Unrealized Gains 22,026,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 12,399,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Securities available for sale, Gross Unrealized Losses (26,380,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 (57,180,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Securities available for sale 2,611,266,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 2,290,937,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Other U.S. Government Agencies    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 1,755,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 2,202,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Securities available for sale, Gross Unrealized Gains 52,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 124,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Securities available for sale, Gross Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Securities available for sale 1,807,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 2,326,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
States And Municipalities    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 10,205,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 15,155,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available for sale, Gross Unrealized Gains 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available for sale, Gross Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available for sale 10,205,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 15,155,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Equity and other    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Amortized Cost 182,184,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [3] 226,376,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [4]
Securities available for sale, Gross Unrealized Gains 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [3] 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [4]
Securities available for sale, Gross Unrealized Losses (114,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [3] (22,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [4]
Securities available for sale 182,070,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [3] 226,354,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [4]
Schedule Of Held To Maturity Securities [Line Items]    
Securities held to maturity, Amortized cost 0us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		  
Securities held to maturity, Fair Value $ 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		  
[1]

Includes $3.3billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[2]

Includes $3.1 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[3]

Includes restricted investments in FHLB-Cincinnati stock of $87.9million and FRB stock of $66.0million. The remainder is money market and cost method investments.
[4]

Includes restricted investments in FHLB-Cincinnati stock of $128.0 million and FRB stock of $66.0million. The remainder is money market, venture capital, and cost method investments.