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Fair Value Of Assets And Liabilities (Changes In Fair Value Of Assets And Liabilities Which Fair Value Option Included In Current Period Earnings) (Details) (Mortgage Banking Noninterest Income, Loans Held-For-Sale, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mortgage Banking Noninterest Income | Loans Held-For-Sale
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Changes in fair value included in net income $ 1,142us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByMeasurementFrequencyAxis
= fhn_LoansHeldForSaleMember
/ fhn_FairValueOfLoansAxis
= fhn_MortgageBankingNoninterestIncomeMember		 $ 1,187us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByMeasurementFrequencyAxis
= fhn_LoansHeldForSaleMember
/ fhn_FairValueOfLoansAxis
= fhn_MortgageBankingNoninterestIncomeMember