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Leases - Maturity of Lease Liabilities (Details) $ in Thousands | Mar. 31, 2019 USD ($)
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Leases [Abstract] |
2019 | $ 18,489
2020 | 23,911
2021 | 21,630
2022 | 20,535
2023 | 19,627
2024 and after | 143,048
Total future minimum lease payments | 247,240
Less lease liability interest | (47,805)
Present value of net future minimum lease payments | $ 199,435

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- Definition Lease, Liability + References No definition available. + Details
Name: | fhn_LeaseLiability
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Lease, Liability, Payments, Due + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDue
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Lease, Liability, Payments, Due After Year Five + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueAfterYearFive
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due Year Five + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearFive
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due Year Four + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearFour
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due Year Three + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearThree
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due Year Two + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearTwo
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Remainder of Fiscal Yea + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsRemainderofFiscalYea
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Undiscounted Excess Amount + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityUndiscountedExcessAmount
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration