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Acquisitions and Divestitures (Narrative) (Details) (USD $)
10 Months Ended
Oct. 21, 2014
number
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Oct. 17, 2014
number
Business Acquisition [Line Items]            
Goodwill   $ 145,932,000us-gaap_Goodwill $ 145,932,000us-gaap_Goodwill $ 141,943,000us-gaap_Goodwill $ 141,943,000us-gaap_Goodwill  
Branch Acquisition            
Business Acquisition [Line Items]            
Number of bank branches FTBNA agreed to purchase           13fhn_NumberOfBankBranches2
/ dei_LegalEntityAxis
= fhn_BranchAcquisitionMember
Deposit Premium           3.32%fhn_DepositPremium
/ dei_LegalEntityAxis
= fhn_BranchAcquisitionMember
Branch Acquisition | As Recorded by FHN            
Business Acquisition [Line Items]            
Assets acquired           437,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ dei_LegalEntityAxis
= fhn_BranchAcquisitionMember
/ us-gaap_StatementScenarioAxis
= fhn_AsRecordedByCompanyMember
Cash and cash equivalents           413,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ dei_LegalEntityAxis
= fhn_BranchAcquisitionMember
/ us-gaap_StatementScenarioAxis
= fhn_AsRecordedByCompanyMember
Premises and equipment           7,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= fhn_BranchAcquisitionMember
/ us-gaap_StatementScenarioAxis
= fhn_AsRecordedByCompanyMember
Goodwill and intangible assets           15,700,000fhn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibles
/ dei_LegalEntityAxis
= fhn_BranchAcquisitionMember
/ us-gaap_StatementScenarioAxis
= fhn_AsRecordedByCompanyMember
Deposits assumed           437,200,000fhn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits
/ dei_LegalEntityAxis
= fhn_BranchAcquisitionMember
/ us-gaap_StatementScenarioAxis
= fhn_AsRecordedByCompanyMember
Goodwill           4,000,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= fhn_BranchAcquisitionMember
/ us-gaap_StatementScenarioAxis
= fhn_AsRecordedByCompanyMember
Trustatlantic Financial Corporation            
Business Acquisition [Line Items]            
Acquisition date Oct. 21, 2014          
Number Of Bank Branches 5fhn_NumberOfBankBranches
/ dei_LegalEntityAxis
= fhn_TrustatlanticFinancialCorporationMember