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Regulatory Capital (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Undivided profits | $ 1,160,434 | $ 1,029,032 |
Dividend paid to parent company | 250,000 | 250,000 |
First Tennessee Bank National Association |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Undivided profits | 869,100 |  |
Positive (negative) amount available for dividend payments | $ (156,700) |  |
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 | $ 388,200 |  |
Percent of capital stock and surplus threshold for credit extension to affiliates | 20.00% |  |
Maximum amount of credit bank may extend to all affiliates | $ 766,300 |  |
First Horizon National Corporation |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Covered transactions | 900 |  |
FTN Financial Securities Corporation |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Total equity investment from FTBNA | 360,700 |  |
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 | 278,400 | 259,200 |
Vault cash included in cash reserves | $ 255,200 | $ 158,900 |
Subsequent Event | First Tennessee Bank National Association |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Positive (negative) amount available for dividend payments |  |  | $ 51,100

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