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Loans (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 07, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructurings loans $ 331,300,000us-gaap_FinancingReceivableModificationsRecordedInvestment $ 352,300,000us-gaap_FinancingReceivableModificationsRecordedInvestment      
Allowance for loan losses 232,448,000us-gaap_LoansAndLeasesReceivableAllowance 253,809,000us-gaap_LoansAndLeasesReceivableAllowance 276,963,000us-gaap_LoansAndLeasesReceivableAllowance 384,351,000us-gaap_LoansAndLeasesReceivableAllowance  
Average balance of impaired loans 371,558,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 442,277,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment      
Interest income recognized on impaired loan 6,632,000us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 7,117,000us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod      
Forbearance agreements time period 6 months        
Loans, net of unearned income 16,230,166,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 15,389,074,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 16,708,582,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome    
Provision for loan losses 27,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses 55,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses 78,000,000us-gaap_ProvisionForLoanLeaseAndOtherLosses [1]    
Loan loss provision on PCI loans 3,300,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesProvisionForLoanLosses1 1,200,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesProvisionForLoanLosses1      
Allowance - purchased credit impaired loans 3,185,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses 817,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses      
Acquired From FDIC | Mountain National Bank          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans acquired         249,001,000fhn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsLoansReceivable
/ dei_LegalEntityAxis
= fhn_MountainNationalBankMember
/ us-gaap_StatementScenarioAxis
= fhn_AcquiredFromFdicMember
Permanent Mortgage Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses 19,122,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 22,491,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 24,928,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 26,194,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		  
TDR, reduction of interest rate by increment, basis points 0.25%fhn_BasisPointsIncrements
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		        
TDRS Maturities 40 years        
Loans, net of unearned income 538,961,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 662,242,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 [2] 765,583,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		    
Modified interest rate increase 1.00%fhn_ModifiedInterestRateIncrease
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		        
Provision for loan losses 208,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 5,024,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 9,314,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 [1]    
Allowance - purchased credit impaired loans 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember		      
Loans Held-For-Sale          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructurings loans 80,100,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_LoansHeldForSaleMember		 135,600,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_LoansHeldForSaleMember		      
Residential Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk, percentage 34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember		        
Consumer Real Estate Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk, percentage 31.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		        
Allowance for loan losses 113,011,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 126,785,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 128,949,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 165,077,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		  
TDRS Maturities 30 years        
Loans, net of unearned income 5,048,071,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 [3] 5,333,371,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 [3] 5,688,703,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		    
Provision for loan losses 8,793,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 50,118,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 94,020,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 [1]    
Allowance - purchased credit impaired loans 77,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 11,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		      
Modified Loans Classified As A TDR          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses 59,000,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ModifiedLoansClassifiedAsTdrMember		 64,600,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ModifiedLoansClassifiedAsTdrMember		      
Ratio of the allowance for loan losses to loans 18.00%fhn_RatioOfAllowanceForLoanLossesToLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ModifiedLoansClassifiedAsTdrMember		 18.00%fhn_RatioOfAllowanceForLoanLossesToLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ModifiedLoansClassifiedAsTdrMember		      
Loans To Mortgage Companies          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage contributed in total loan 7.00%fhn_PercentageContributedBySegmentLoansInTotalLoan
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_LoansToMortgageCompaniesMember		        
Concentration risk, percentage 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_LoansToMortgageCompaniesMember		        
Commercial loans 1,163,018,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_LoansToMortgageCompaniesMember		 790,609,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_LoansToMortgageCompaniesMember		 [4]      
Loans, net of unearned income 1,163,018,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_LoansToMortgageCompaniesMember		 790,609,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_LoansToMortgageCompaniesMember		      
Commercial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses 85,585,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 96,245,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 [4]      
Average balance of impaired loans 77,431,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 150,453,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		      
Interest income recognized on impaired loan 786,000us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 937,000us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		      
Commercial loans 10,285,003,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 9,010,932,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 [4]      
Time period of default probability 1 year        
Loans pledged to secure potential borrowings from Federal Reserve Bank 6,100,000us-gaap_LoansPledgedAsCollateral
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		        
Allowance - purchased credit impaired loans 3,108,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		        
Credit Card & Other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses 14,730,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 7,484,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 6,898,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 7,081,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		  
Loans, net of unearned income 358,131,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 336,606,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 289,105,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		    
Provision for loan losses 19,046,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 9,321,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 9,239,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 [1]    
Allowance - purchased credit impaired loans 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		 2,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardAndOtherPortfolioSegmentMember		      
Credit Card          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Credit card workout program, granted rate reduction 0.00%fhn_CreditCardWorkoutProgramGrantedRateReduction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardClassMember		        
Loans, net of unearned income 188,746,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardClassMember		 185,959,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CreditCardClassMember		      
Heloc And Real Estate Installment Classes          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
TDR, reduction of interest rate by increment, basis points 0.25%fhn_BasisPointsIncrements
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_HelocAndRealEstateInstallmentClassesMember		        
Restricted And Secured Consumer Real Estate Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, net of unearned income 76,800,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_RestrictedAndSecuredConsumerRealEstateLoansMember		 333,800,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_RestrictedAndSecuredConsumerRealEstateLoansMember		      
Restricted And Secured Permanent Mortgage Real Estate Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, net of unearned income   11,200,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_RestrictedAndSecuredPermanentMortgageRealEstateLoansMember		      
Finance And Insurance Companies          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage contributed in total loan 12.00%fhn_PercentageContributedBySegmentLoansInTotalLoan
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_FinanceAndInsuranceCompaniesMember		        
Concentration risk, percentage 22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_FinanceAndInsuranceCompaniesMember		        
Commercial loans 2,000,000,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_FinanceAndInsuranceCompaniesMember		        
Finance Insurance And Loans To Mortgage Companies          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage contributed in total loan 35.00%fhn_PercentageContributedBySegmentLoansInTotalLoan
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_FinanceInsuranceAndLoansToMortgageCompaniesMember		        
Purchased Credit Impaired Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net charge-offs 100,000us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PurchasedCreditImpairedLoansMember		 400,000us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PurchasedCreditImpairedLoansMember		      
Maximum | Permanent Mortgage Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Modified interest rate time period 5 years        
Maximum | Commercial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Forbearance agreements time period 12 months        
Maximum | Credit Card          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payment reductions, time period 1 year        
Credit card workout program, term extension 5 years        
Maximum | Heloc And Real Estate Installment Classes          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Modified interest rate time period 5 years        
Minimum | Non-Accruing          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired commercial loans 1,000,000fhn_ImpairedCommercialLoans
/ fhn_LoansAccruingAndNonAccruingInformationByClassAxis
= fhn_NonAccruingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Minimum | Permanent Mortgage Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Modified interest rate 2.00%fhn_ModifiedInterestRate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_PermanentMortgagePortfolioSegmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Modified interest rate time period 5 years        
Minimum | Credit Card          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Payment reductions, time period 6 months        
Minimum | Heloc And Real Estate Installment Classes          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Modified interest rate 1.00%fhn_ModifiedInterestRate
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_HelocAndRealEstateInstallmentClassesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Pass | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 12fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Pass | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 1fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Special Mention          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 13fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		        
Substandard          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 14fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		        
Doubtful          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 15fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		        
Unlikely to be Collected Financing Receivable | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 16fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
PD Grade 1          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses 70,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanPDGradeOneMember		 85,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanPDGradeOneMember		      
Lowest expected default probability 1fhn_LowestExpectedDefaultProbability
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanPDGradeOneMember		        
PD Grade 12          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses 4,622,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanPDGradeTwelveMember		 2,488,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanPDGradeTwelveMember		      
PD Grade 13          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses 3,590,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanPDGradeThirteenMember		 9,047,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanPDGradeThirteenMember		      
PD Grade 13 | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loans 500,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanPDGradeThirteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
LGD Grade 1 | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 12fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanLGDGradeOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
LGD Grade 1 | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 1fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanLGDGradeOneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
LGD Grade 12 | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loan grades 12fhn_CommercialLoanGrades
/ us-gaap_InternalCreditAssessmentAxis
= fhn_CommercialLoanLGDGradeTwelveMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Loan Reassessed | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial loans $ 1,000,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= fhn_LoanReassessedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
[1]

2012 includes approximately $23 million of loan loss provision related to dischargedbankruptcies.
[2]

Balance as of December 31, 2013, includes $11.2 million of restricted and secured real estate loans. See Note 22 - Variable Interest Entities for additional information.
[3]

Balances as of December 31, 2014 and 2013, include $76.8 million and $333.8 million of restricted and secured real estate loans, respectively. See Note 22 - Variable Interest Entities for additional information.
[4]

December 31, 2013 table excludes PCI loans amounting to $45.9 million ($.8 million of allowance).