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Fair Value Of Assets And Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 number | Mar. 31, 2013
Fair Value Of Assets And Liabilities [Abstract] |  |
Gain/(loss) on instrument specific credit risk | $ 1.8 | $ 1.9
Number of levels assets and liabilities are grouped in | 3 |

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- Details
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Namespace Prefix: | fhn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Assets and liabilities measured at fair value are grouped into three levels. + References No definition available. + Details
Name: | fhn_NumberOfLevelsAssetsAndLiabilitiesAreGroupedIn
Namespace Prefix: | fhn_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration