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Securities Purchased Under Agreements To Resell And Collateral Pledged By Company (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Securities Purchased under Agreements to Resell [Abstract]    
Gross amounts of recognized assets $ 659,154,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross $ 412,614,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross
Gross amounts offset in the Statement of Condition 0fhn_SecuritiesPurchasedUnderAgreementsToResellGrossAmountsOffsetInStatementOfCondition 0fhn_SecuritiesPurchasedUnderAgreementsToResellGrossAmountsOffsetInStatementOfCondition
Net amounts of assets presented in the Statement of Condition 659,154,000us-gaap_SecuritiesPurchasedUnderAgreementsToResell 412,614,000us-gaap_SecuritiesPurchasedUnderAgreementsToResell
Offsetting securities sold under agreements to repurchase (48,655,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability (8,672,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability
Securities collateral (not recognized on FHN's Statement of Condition) (602,403,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities (396,855,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities
Net amount $ 8,096,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral $ 7,087,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral