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Investment Securities (Schedule Of Amortized Cost And Fair Value By Contractual Maturity) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]    
Within 1 year, Amortized Cost $ 1,755,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
After 1 year; within 5 years, Amortized Cost 1,600,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
After 5 years; within 10 years, Amortized Cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
After 10 years, Amortized Cost 8,705,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Subtotal, Amortized Cost 12,060,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Within 1 year, Fair Value 1,807,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
After 1 year; within 5 years, Fair Value 1,600,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
After 5 years; within 10 years, Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
After 10 years, Fair Value 8,705,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Subtotal, Fair Value 12,112,000us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Securities available for sale, Amortized Cost 3,526,482,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [1] 3,416,283,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [2]
Securities available for sale 3,556,613,000us-gaap_AvailableForSaleSecurities [1] 3,398,457,000us-gaap_AvailableForSaleSecurities [2]
HTM, Within 1 year, Amortized Cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
HTM, After 1 year; within 5 years, Amortized Cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
HTM, After 5 years; within 10 years, Amortized Cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
HTM, After 10 years, Amortized Cost 4,292,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
HTM Subtotal, Amortized Cost 4,292,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis  
HTM, Within 1 year, Fair Value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
HTM, After 1 year; within 5 years, Fair Value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
HTM, After 5 years; within 10 years, Fair Value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
HTM, After 10 years, Fair Value 5,404,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
HTM Subtotal, Fair Value 5,404,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue  
Securities held to maturity, Amortized cost 4,292,000us-gaap_HeldToMaturitySecurities 0us-gaap_HeldToMaturitySecurities
Securities held to maturity, Fair Value 5,404,000us-gaap_HeldToMaturitySecuritiesFairValue  
Government Agency Issued MBS And CMO    
Schedule of Investments [Line Items]    
Securities available for sale, Amortized Cost 3,332,238,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_GovernmentAgencyIssuedMbsAndCmoMember		  
Securities available for sale 3,362,431,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_GovernmentAgencyIssuedMbsAndCmoMember		  
Securities held to maturity, Amortized cost 0us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_GovernmentAgencyIssuedMbsAndCmoMember		  
Securities held to maturity, Fair Value 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_GovernmentAgencyIssuedMbsAndCmoMember		  
Equity and other    
Schedule of Investments [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 182,070,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [3] 226,354,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [4]
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.