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Restructuring, Repositioning, And Efficiency (Narrative) (Details) (USD $)
12 Months Ended 93 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Restructuring And Related Activities [Abstract]        
Net costs (income) recognized, related to restructuring, repositioning, and efficiency activities $ 7,000,000us-gaap_RestructuringAndRelatedCostIncurredCost $ 5,300,000us-gaap_RestructuringAndRelatedCostIncurredCost $ 24,900,000us-gaap_RestructuringAndRelatedCostIncurredCost  
Exit costs 7,300,000fhn_ExitCosts 3,800,000fhn_ExitCosts 23,100,000fhn_ExitCosts  
Severance and other employee costs 2,641,000fhn_SeveranceAndOtherEmployeeCosts 3,691,000fhn_SeveranceAndOtherEmployeeCosts 22,897,000fhn_SeveranceAndOtherEmployeeCosts 107,025,000fhn_SeveranceAndOtherEmployeeCosts
Lease abandonment expense 4,696,000fhn_FacilityConsolidationCosts 131,000fhn_FacilityConsolidationCosts 46,000fhn_FacilityConsolidationCosts 45,523,000fhn_FacilityConsolidationCosts
Mortgage banking (income)/ expense on servicing sales $ (553,000)fhn_MortgageBankingExpenseOnServicingSales $ 2,192,000fhn_MortgageBankingExpenseOnServicingSales $ 2,635,000fhn_MortgageBankingExpenseOnServicingSales $ 25,449,000fhn_MortgageBankingExpenseOnServicingSales