XML 1143 R84.htm IDEA: XBRL DOCUMENT v2.4.1.9
Allowance For Loan Losses (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Retail Loans [Member]  
Financing Receivable, Allowance for Credit Losses [Line Items]  
Time period within which inherent losses are recognized 12 months
Maximum [Member] | Pass  
Financing Receivable, Allowance for Credit Losses [Line Items]  
Commercial loan grades 12fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | 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
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Commercial Loan L G D Grade One [Member]  
Financing Receivable, Allowance for Credit Losses [Line Items]  
Commercial loan grades 12fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanLGDGradeOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | 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
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum [Member] | Pass  
Financing Receivable, Allowance for Credit Losses [Line Items]  
Commercial loan grades 1fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | 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
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | Non Accruing [Member]  
Financing Receivable, Allowance for Credit Losses [Line Items]  
Impaired commercial loans 1fhn_ImpairedCommercialLoans
/ fhn_LoansAccruingAndNonAccruingInformationByClassAxis
= fhn_NonAccruingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember