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Mortgage Banking Activity - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net loans and leases | $ 62,446 |  | $ 62,446 |  | $ 61,750
Mortgage banking income | 10 | $ 10 | 18 | $ 19 |
Mortgage Banking |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Mortgage banking income |  |  | 2 | $ 2 |
First Horizon Bank |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net loans and leases | $ 28 |  | $ 28 |  |

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