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Investment Securities (Schedule Of FHN's Investment Securities) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Securities available for sale, Amortized Cost $ 3,612,866,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [1] $ 3,574,144,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [2]  
Securities available for sale, Gross Unrealized Gains 70,784,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains [1] 48,433,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains [2]  
Securities available for sale, Gross Unrealized Losses (11,319,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss [1] (51,398,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss [2]  
Securities available for sale 3,672,331,000us-gaap_AvailableForSaleSecurities [1] 3,571,179,000us-gaap_AvailableForSaleSecurities [2] 3,556,613,000us-gaap_AvailableForSaleSecurities
Pledged available for sale securities 3,200,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral 3,300,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral  
Schedule Of Held To Maturity Securities [Line Items]      
Securities held to maturity, Amortized cost 4,299,000us-gaap_HeldToMaturitySecurities 4,274,000us-gaap_HeldToMaturitySecurities 4,292,000us-gaap_HeldToMaturitySecurities
Securities held to maturity, Gross Unrealized Gains 1,152,000us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains 1,180,000us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains  
Securities held to maturity, Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses  
Securities held to maturity, Fair Value 5,451,000us-gaap_HeldToMaturitySecuritiesFairValue 5,454,000us-gaap_HeldToMaturitySecuritiesFairValue  
U S States And Political Subdivisions [Member]      
Schedule Of Held To Maturity Securities [Line Items]      
Securities held to maturity, Amortized cost 4,299,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 4,274,000us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Securities held to maturity, Gross Unrealized Gains 1,152,000us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 1,180,000us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Securities held to maturity, Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
Securities held to maturity, Fair Value 5,451,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 5,454,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		  
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		 87,900,000us-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		 39,989,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		  
Securities available for sale, Gross Unrealized Gains 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 1,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		  
Securities available for sale, Gross Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		  
Securities available for sale 100,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 39,990,000us-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 727,828,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 762,069,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Securities available for sale, Gross Unrealized Gains 35,718,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 34,332,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Securities available for sale, Gross Unrealized Losses (696,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 (3,839,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Securities available for sale 762,850,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 792,562,000us-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 2,691,544,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 2,565,310,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		  
Securities available for sale, Gross Unrealized Gains 35,030,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 13,996,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		  
Securities available for sale, Gross Unrealized Losses (10,427,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 (47,536,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		  
Securities available for sale 2,716,147,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 2,531,770,000us-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 1,655,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 2,078,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		  
Securities available for sale, Gross Unrealized Gains 36,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 104,000us-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 1,691,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember		 2,182,000us-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 9,905,000us-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 9,905,000us-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 181,834,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [3] 189,543,000us-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 (196,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [3] (23,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [4]  
Securities available for sale 181,638,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [3] 189,520,000us-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 $3.2billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[2]

Includes $3.3 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 $87.9 million and FRB stock of $66.0million. The remainder is money market, venture capital, and cost method investments.