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Investment Securities (Schedule Of Amortized Cost And Fair Value By Contractual Maturity) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Schedule of Investments [Line Items]      
Within 1 year, Amortized Cost $ 1,655,000us-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 8,405,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost    
Subtotal, Amortized Cost 11,660,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis    
Within 1 year, Fair Value 1,691,000us-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 8,405,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue    
Subtotal, Fair Value 11,696,000us-gaap_AvailableForSaleSecuritiesDebtSecurities    
Securities available for sale, Amortized Cost 3,612,866,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [1]   3,574,144,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [2]
Securities available for sale 3,672,331,000us-gaap_AvailableForSaleSecurities [1] 3,556,613,000us-gaap_AvailableForSaleSecurities 3,571,179,000us-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 4,299,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount    
HTM Subtotal, Amortized Cost 4,299,000us-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 5,451,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue    
HTM Subtotal, Fair Value 5,451,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue    
Securities held to maturity, Amortized cost 4,299,000us-gaap_HeldToMaturitySecurities 4,292,000us-gaap_HeldToMaturitySecurities 4,274,000us-gaap_HeldToMaturitySecurities
Securities held to maturity, Fair Value 5,451,000us-gaap_HeldToMaturitySecuritiesFairValue   5,454,000us-gaap_HeldToMaturitySecuritiesFairValue
Government Agency Issued MBS And CMO      
Schedule of Investments [Line Items]      
Securities available for sale, Amortized Cost 3,419,372,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_GovernmentAgencyIssuedMbsAndCmoMember		 [3]    
Securities available for sale 3,478,997,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_GovernmentAgencyIssuedMbsAndCmoMember		 [3]    
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 181,834,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [4]   189,543,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [5]
Securities available for sale 181,638,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [4]   189,520,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fhn_EquityAndOtherDebtSecuritiesMember		 [5]
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]

Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
[4]

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.
[5]

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.