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Regulatory Capital and Restrictions - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Undivided profits |  | $ 1,798,442 | $ 1,542,408 |
Dividend paid to parent company |  | $ 345,000 | $ 420,000 |
First Horizon Bank |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Tier 1 Capital, Actual Ratio |  | 10.18% | 10.72% |
Undivided profits |  | $ 1,200,000 |  |
Percent of capital stock and surplus threshold for credit extension to parent and certain financial subsidiaries |  | 10.00% |  |
Maximum amount of credit bank may extend to parent and certain financial institutions |  | $ 426,000 |  |
Covered transactions |  | $ 800 |  |
Percent of capital stock and surplus threshold for credit extension to affiliates |  | 20.00% |  |
Maximum amount of credit bank may extend to all affiliates |  | $ 851,900 |  |
FHN Financial Securities Corp. |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Covered transactions |  | $ 390,400 |  |
First Horizon National Corporation |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Tier 1 Capital, Actual Ratio |  | 10.15% | 10.80% |
First Horizon Advisors, Inc. |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Covered transactions |  | $ 34,700 |  |
All Affiliates Member |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Covered transactions |  | 425,900 |  |
Minimum | First Horizon Bank |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Cash reserve required |  | 396,100 | $ 371,700 |
Vault cash included in cash reserves |  | $ 273,700 | $ 273,700 |
Subsequent Event |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Dividend paid to parent company | $ 65,000 |  |  |
Subsequent Event | First Horizon Bank |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Positive (negative) amount available for dividend payments |  |  |  | $ 331,200

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