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Variable Interest Entities (Narrative) (Details) | Sep. 30, 2013 number | Mar. 31, 2013 Home Equity [Member] number
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Number of consolidated securitization trusts with agreements to sell servicing | 1 |
Number Of Securitization Trusts That Have Entered Rapid Amortization Period |  | 2

X
- Definition The number of consolidated securitization trusts with agreements to sell servicing. + References No definition available. + Details
Name: | fhn_NumberOfConsolidatedSecuritizationTrustsWithAgreementsToSellServicing
Namespace Prefix: | fhn_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securitization trusts that have entered a rapid amortization period. + References No definition available. + Details
Name: | fhn_NumberOfSecuritizationTrustsThatHaveEnteredRapidAmortizationPeriod
Namespace Prefix: | fhn_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

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