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Intangible Assets (Narrative) (Details) (USD $)
Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]  
Gross carrying amount of other intangible assets $ 70,300,000us-gaap_OtherFiniteLivedIntangibleAssetsGross
Intangible assets accumulated amortization 42,100,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Future Amortization Expense, Remainder of Fiscal Year 3,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
Estimated aggregate amortization expense, Year 2016 5,000,000fhn_FiniteLivedIntangibleAssetsIncludingFinancialAssetsAmortizationExpenseNextTwelveMonths
Estimated aggregate amortization expense, Year 2017 4,700,000fhn_FiniteLivedIntangibleAssetsIncludingFinancingAssetsAmortizationExpenseYearTwo
Estimated aggregate amortization expense, Year 2018 4,500,000fhn_FiniteLivedIntangibleAssetsIncludingFinancialAssetsAmortizationExpenseYearThree
Estimated aggregate amortization expense, Year 2019 4,200,000fhn_FiniteLivedIntangibleAssetsIncludingFinancialAssetsAmortizationExpenseYearFour
Estimated aggregate amortization expense, Year 2020 $ 1,500,000fhn_FiniteLivedIntangibleAssetsIncludingFinancingAssetsAmortizationExpenseYearFive