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Consolidated Condensed Statements of Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Consolidated Condensed Statements Of Income [Abstract] |  |
Pension and post-retirement plans expense reclassified from accumulated other comprehensive income | $ 0.7 | $ 2.5
Income tax benefit reclassified from accumulated other comprehensive income | $ 0.3 | $ 1.0

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- Definition Reclassification From Accumulated Other Comprehensive Income For The Current Period, Tax Effect + References No definition available. + Details
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Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
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- Details
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Period Type: | duration

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration