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Allowance For Loan Losses (Narrative) (Details)
Mar. 31, 2015
number
Unlikely to be Collected Financing Receivable  
Financing Receivable, Allowance for Credit Losses [Line Items]  
Commercial loan grades 16fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Commercial Loan L G D Grade One [Member]  
Financing Receivable, Allowance for Credit Losses [Line Items]  
Commercial loan grades 1fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanLGDGradeOneMember
Commercial Loan L G D Grade Twelve [Member]  
Financing Receivable, Allowance for Credit Losses [Line Items]  
Commercial loan grades 12fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanLGDGradeTwelveMember