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Loans (Schedule Of Loans By Portfolio Segment) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income $ 16,230,166,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 15,389,074,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 16,708,582,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome  
Allowance for loan losses 232,448,000us-gaap_LoansAndLeasesReceivableAllowance 253,809,000us-gaap_LoansAndLeasesReceivableAllowance 276,963,000us-gaap_LoansAndLeasesReceivableAllowance 384,351,000us-gaap_LoansAndLeasesReceivableAllowance
Total net loans 15,997,718,000us-gaap_LoansAndLeasesReceivableNetReportedAmount 15,135,265,000us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Commercial Financial And Industrial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income 9,007,286,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CommercialFinancialAndIndustrialPortfolioSegmentMember		 7,923,576,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CommercialFinancialAndIndustrialPortfolioSegmentMember		 8,796,956,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CommercialFinancialAndIndustrialPortfolioSegmentMember		  
Allowance for loan losses 67,011,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CommercialFinancialAndIndustrialPortfolioSegmentMember		 86,446,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CommercialFinancialAndIndustrialPortfolioSegmentMember		 96,191,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CommercialFinancialAndIndustrialPortfolioSegmentMember		 130,413,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_CommercialFinancialAndIndustrialPortfolioSegmentMember
Commercial Real Estate Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income 1,277,717,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 1,133,279,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 1,168,235,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Allowance for loan losses 18,574,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 10,603,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 19,997,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 55,586,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Consumer Real Estate Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income 5,048,071,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 [1] 5,333,371,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_ConsumerRealEstatePortfolioSegmentMember		 [1] 5,688,703,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ 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
Permanent Mortgage Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
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		  
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
Credit Card And Other Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
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		  
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
Restricted And Secured Consumer Real Estate Loans [Member]        
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 [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income   $ 11,200,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fhn_RestrictedAndSecuredPermanentMortgageRealEstateLoansMember		    
[1]

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.
[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.