XML 145 R143.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Derivatives - Derivatives Associated With Interest Rate Risk Management Activities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Customer Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | $ 2,697,522 | $ 2,271,448
Assets | 65,768 | 18,744
Liabilities | 6,858 | 27,768
Offsetting Upstream Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 2,697,522 | 2,271,448
Assets | 2,583 | 4,014
Liabilities | 3,994 | 9,041
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Customer Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 3,044,067 | 2,029,162
Assets | 90,394 | 20,262
Liabilities | 3,515 | 25,880
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Offsetting Upstream Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 3,044,067 | 2,029,162
Assets | 3,537 | 8,154
Liabilities | 9,735 | 9,153
Debt Hedging | Hedging Instruments And Hedged Items | Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 500,000 | 900,000
Assets |  | 127
Liabilities | 69 | 6
Debt Hedging | Hedging Instruments And Hedged Items | Par |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | 500,000 | 900,000
Debt Hedging | Hedging Instruments And Hedged Items | Cumulative fair value hedging adjustments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | (1,604) | (15,094)
Debt Hedging | Hedging Instruments And Hedged Items | Unamortized premium/(discount) and issuance costs |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | (740) | (2,295)
Debt Hedging | Hedging Instruments And Hedged Items | Term Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | $ 497,656 | $ 882,611

X
- Definition Amount of hedged item in hedging relationship. Excludes hedged asset or liability. + References No definition available. + Details
Name: | us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References No definition available. + Details
Name: | us-gaap_InterestRateDerivativeAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References No definition available. + Details
Name: | us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fhn_CustomerInterestRateContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fhn_OffsettingUpstreamInterestRateContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fhn_CustomerInterestRateContractsHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fhn_TermBorrowingsParMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fhn_TermBorrowingsCumulativeFairValueHedgingAdjustmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fhn_TermBorrowingsUnamortizedPremiumDiscountandIssuanceCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_LongTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |