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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2017
Brokers and Dealers [Abstract] |
Summary Of Actual Capital Amounts And Ratios | The actual capital amounts and ratios of FHN and FTBNA are presented in the table below.
(Dollars in thousands) |  | First Horizon National Corporation |  | First Tennessee Bank National Association
Amount |  | Ratio |  | Amount |  | Ratio
On December 31, 2017 |  |  |  |  |  |  |  |
Actual: |  |  |  |  |  |  |  |
Total Capital |  | $ | 3,703,754 |  |  | 11.10 | % |  | $ | 3,520,670 |  |  | 10.74 | %
Tier 1 Capital |  | 3,281,478 |  |  | 9.83 |  |  | 3,317,684 |  |  | 10.12 |
Common Equity Tier 1 |  | 2,962,155 |  |  | 8.88 |  |  | 3,041,420 |  |  | 9.28 |
Leverage |  | 3,281,478 |  |  | 10.31 |  |  | 3,317,684 |  |  | 10.70 |
Minimum Requirement for Capital Adequacy Purposes: |  |  |  |  |  |  |  |
Total Capital |  | 2,669,910 |  |  | 8.00 |  |  | 2,622,924 |  |  | 8.00 |
Tier 1 Capital |  | 2,002,433 |  |  | 6.00 |  |  | 1,967,193 |  |  | 6.00 |
Common Equity Tier 1 |  | 1,501,824 |  |  | 4.50 |  |  | 1,475,395 |  |  | 4.50 |
Leverage |  | 1,272,990 |  |  | 4.00 |  |  | 1,240,647 |  |  | 4.00 |
Minimum Requirement to be Well Capitalized Under Prompt Corrective Action Provisions: |  |  |  |  |  |  |  |
Total Capital |  |  |  |  |  | 3,278,655 |  |  | 10.00 |
Tier 1 Capital |  |  |  |  |  | 2,622,924 |  |  | 8.00 |
Common Equity Tier 1 |  |  |  |  |  | 2,131,126 |  |  | 6.50 |
Leverage |  |  |  |  |  | 1,550,809 |  |  | 5.00 |
On December 31, 2016 |  |  |  |  |  |  |  |
Actual: |  |  |  |  |  |  |  |
Total Capital |  | $ | 2,926,010 |  |  | 12.24 | % |  | $ | 2,762,271 |  |  | 11.78 | %
Tier 1 Capital |  | 2,671,871 |  |  | 11.17 |  |  | 2,538,382 |  |  | 10.83 |
Common Equity Tier 1 |  | 2,377,987 |  |  | 9.94 |  |  | 2,298,080 |  |  | 9.80 |
Leverage |  | 2,671,871 |  |  | 9.35 |  |  | 2,538,382 |  |  | 9.16 |
Minimum Requirement for Capital Adequacy Purposes: |  |  |  |  |  |  |  |
Total Capital |  | 1,913,133 |  |  | 8.00 |  |  | 1,875,780 |  |  | 8.00 |
Tier 1 Capital |  | 1,434,849 |  |  | 6.00 |  |  | 1,406,835 |  |  | 6.00 |
Common Equity Tier 1 |  | 1,076,137 |  |  | 4.50 |  |  | 1,055,126 |  |  | 4.50 |
Leverage |  | 1,143,250 |  |  | 4.00 |  |  | 1,108,406 |  |  | 4.00 |
Minimum Requirement to be Well Capitalized Under Prompt Corrective Action Provisions: |  |  |  |  |  |  |  |
Total Capital |  |  |  |  |  | 2,344,725 |  |  | 10.00 |
Tier 1 Capital |  |  |  |  |  | 1,875,780 |  |  | 8.00 |
Common Equity Tier 1 |  |  |  |  |  | 1,524,071 |  |  | 6.50 |
Leverage |  |  |  |  |  | 1,385,508 |  |  | 5.00 |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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