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Regulatory Capital and Restrictions - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Undivided profits |  | $ 1,542,408 | $ 1,160,434 |
Dividend paid to parent company |  | 420,000 | 250,000 |
First Tennessee Bank National Association |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Undivided profits |  | 1,000,000 |  |
Positive (negative) amount available for dividend payments |  | $ 222,000 |  |
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 |  | $ 405,000 |  |
Percent of capital stock and surplus threshold for credit extension to affiliates |  | 20.00% |  |
Maximum amount of credit bank may extend to all affiliates |  | $ 810,000 |  |
First Horizon National Corporation |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Covered transactions |  | 800 |  |
FTN Financial Securities Corporation |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Total equity investment from FTBNA |  | 360,900 |  |
All Affiliates Member |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Covered transactions |  | 361,700 |  |
Minimum | First Tennessee Bank National Association |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Cash reserve required |  | 371,700 | 278,400 |
Vault cash included in cash reserves |  | $ 273,700 | $ 255,200 |
Subsequent Event |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Dividend paid to parent company | $ 110,000 |  |  |
Subsequent Event | First Tennessee Bank National Association |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Positive (negative) amount available for dividend payments |  |  |  | $ 156,200

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