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Other Events (Narrative) (Details) - USD ($) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
Debt Instrument [Line Items] |  |  |  |
Term borrowings |  | $ 1,341,186,000 | $ 1,880,105,000 | $ 1,491,138,000
First Horizon National Corporation | Senior Notes | Debt Instrument Maturity Date - 12/15/15 - 5.375% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term borrowings |  | $ 500,000,000 |  |
Debt instrument interest rate |  | 5.375% |  |
Debt instrument maturity date |  | Dec. 15, 2015 |  |
First Horizon National Corporation | Senior Notes | Debt Instrument Maturity Date - 12/15/20 - 3.50% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term borrowings | $ 500,000,000 |  |  |
Debt instrument interest rate | 3.50% |  |  |
Debt instrument maturity date | Dec. 15, 2020 |  |  |
Proceeds from issuance | $ 497,000,000 |  |  |

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