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Allowance For Loan Losses (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 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 | 12
Maximum [Member] | Unlikely to be Collected Financing Receivable |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Commercial loan grades | 16
Maximum [Member] | Commercial Loan L G D Grade Twelve [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Commercial loan grades | 12
Minimum [Member] | Non Accruing [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Impaired commercial loans | $ 1
Minimum [Member] | Pass |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Commercial loan grades | 1
Minimum [Member] | Commercial Loan L G D Grade One [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Commercial loan grades | 1

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- Definition Commercial Loan Grades + References No definition available. + Details
Name: | fhn_CommercialLoanGrades
Namespace Prefix: | fhn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Impaired Commercial Loans + References No definition available. + Details
Name: | fhn_ImpairedCommercialLoans
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The time period within which inherent losses that are reflected in the reserves for retail loans are expected to be recognized. + References No definition available. + Details
Name: | fhn_TimePeriodWithinWhichInherentLossesAreRecognized
Namespace Prefix: | fhn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration