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Goodwill and Other Intangible Assets - Schedule Of Estimated Aggregate Amortization Expense for Intangible Assets (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Goodwill and Intangible Assets Disclosure [Abstract] |
Remainder of 2020 | $ 14,921
2021 | 55,943
2022 | 51,498
2023 | 47,859
2024 | 44,040
2025 | $ 37,145

X
- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, including financial assets, excluding goodwill, with a finite life. + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, including financial assets, excluding goodwill, with a finite life. + References No definition available. + Details
Name: | fhn_FiniteLivedIntangibleAssetsIncludingFinancialAssetsAmortizationExpenseYearFour
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, including financial assets, excluding goodwill, with a finite life. + References No definition available. + Details
Name: | fhn_FiniteLivedIntangibleAssetsIncludingFinancialAssetsAmortizationExpenseYearThree
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, including financial assets, excluding goodwill, with a finite life. + References No definition available. + Details
Name: | fhn_FiniteLivedIntangibleAssetsIncludingFinancingAssetsAmortizationExpenseYearFive
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, including financial assets, excluding goodwill, with a finite life. + References No definition available. + Details
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Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
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