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Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions (Tables) | 9 Months Ended
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Sep. 30, 2025
Offsetting [Abstract] |
Schedule of Securities Purchased under Agreements to Resell and Collateral Pledged by Counterparties | The following table provides details of securities purchased under agreements to resell and collateral pledged by counterparties as of September 30, 2025 and December 31, 2024.
SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL
|  |  |  |  |  |  |  | Gross amounts not offset in the Balance Sheets |  |
(Dollars in millions) |  | Gross amounts of recognized assets |  | Gross amounts offset in the Balance Sheets |  | Net amounts of assets presented in the Balance Sheets |  | Offsetting securities sold under agreements to repurchase |  | Securities collateral (not recognized on FHN’s Balance Sheets) |  | Net amount
Securities purchased under agreements to resell: |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2025 |  | $ | 679 |  |  | $ | — |  |  | $ | 679 |  |  | $ | — |  |  | $ | (673) |  |  | $ | 6 |
December 31, 2024 |  | 572 |  |  | — |  |  | 572 |  |  | — |  |  | (567) |  |  | 5 |
Schedule of Securities Sold under Agreements to Repurchase and Collateral Pledged by Company | The following table provides details of securities sold under agreements to repurchase and collateral pledged by FHN as of September 30, 2025 and December 31, 2024.
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE
|  |  |  |  |  |  |  | Gross amounts not offset in the Balance Sheets |  |
(Dollars in millions) |  | Gross amounts of recognized liabilities |  | Gross amounts offset in the Balance Sheets |  | Net amounts of liabilities presented in the Balance Sheets |  | Offsetting securities purchased under agreements to resell |  | Securities/ government guaranteed loans collateral |  | Net amount
Securities sold under agreements to repurchase: |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2025 |  | $ | 1,866 |  |  | $ | — |  |  | $ | 1,866 |  |  | $ | — |  |  | $ | (1,866) |  |  | $ | — |
December 31, 2024 |  | 2,096 |  |  | — |  |  | 2,096 |  |  | — |  |  | (2,096) |  |  | — |
Schedule of the Remaining Contractual Maturity by Collateral Type of Securities Sold under Agreements to Repurchase | The following table provides details, by collateral type, of the remaining contractual maturity of securities sold under agreements to repurchase as of September 30, 2025 and December 31, 2024.
MATURITIES OF SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE
|  | September 30, 2025
(Dollars in millions) |  | Overnight and Continuous |  | Up to 30 Days |  | Total
Securities sold under agreements to repurchase: |  |  |  |  |  |
Government agency issued MBS |  | $ | 1,342 |  |  | $ | — |  |  | $ | 1,342 |
Government agency issued CMO |  | 524 |  |  | — |  |  | 524 |
Total securities sold under agreements to repurchase |  | $ | 1,866 |  |  | $ | — |  |  | $ | 1,866 |
|  | December 31, 2024
(Dollars in millions) |  | Overnight and Continuous |  | Up to 30 Days |  | Total
Securities sold under agreements to repurchase: |  |  |  |  |  |
Government agency issued MBS |  | $ | 1,535 |  |  | $ | — |  |  | $ | 1,535 |
Government agency issued CMO |  | 561 |  |  | — |  |  | 561 |
Total securities sold under agreements to repurchase |  | $ | 2,096 |  |  | $ | — |  |  | $ | 2,096 |

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- Definition Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties [Table Text Block] + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company [Table Text Block] + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of the nature and risks of short-term collateralized financing obtained through repurchase agreements, securities lending transactions and repurchase-to-maturity transactions, accounted for as secured borrowings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 + Details
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