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Regulatory Capital (Schedule of Actual Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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First Horizon National Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital, Actual Amount | $ 3,703,754 | $ 2,926,010
Total Capital, Actual Ratio | 11.10% | 12.24%
Tier 1 Capital, Actual Amount | $ 3,281,478 | $ 2,671,871
Tier 1 Capital, Actual Ratio | 9.83% | 11.17%
Common Equity Tier 1 Capital, Actual Amount | $ 2,962,155 | $ 2,377,987
Common Equity Tier 1 Capital, Actual Ratio | 8.88% | 9.94%
Leverage, Actual Amount | $ 3,281,478 | $ 2,671,871
Leverage, Actual Ratio | 10.31% | 9.35%
Total Capital, Capital Adequacy Purposes, Amount | $ 2,669,910 | $ 1,913,133
Total Capital, Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 2,002,433 | $ 1,434,849
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,501,824 | $ 1,076,137
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 1,272,990 | $ 1,143,250
Leverage, Capital Adequacy Purposes, Ratio | 4.00% | 4.00%
First Tennessee Bank National Association |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital, Actual Amount | $ 3,520,670 | $ 2,762,271
Total Capital, Actual Ratio | 10.74% | 11.78%
Tier 1 Capital, Actual Amount | $ 3,317,684 | $ 2,538,382
Tier 1 Capital, Actual Ratio | 10.12% | 10.83%
Common Equity Tier 1 Capital, Actual Amount | $ 3,041,420 | $ 2,298,080
Common Equity Tier 1 Capital, Actual Ratio | 9.28% | 9.80%
Leverage, Actual Amount | $ 3,317,684 | $ 2,538,382
Leverage, Actual Ratio | 10.70% | 9.16%
Total Capital, Capital Adequacy Purposes, Amount | $ 2,622,924 | $ 1,875,780
Total Capital, Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,967,193 | $ 1,406,835
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,475,395 | $ 1,055,126
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 1,240,647 | $ 1,108,406
Leverage, Capital Adequacy Purposes, Ratio | 4.00% | 4.00%
Total Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 3,278,655 | $ 2,344,725
Total Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 10.00% | 10.00%
Tier 1 Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 2,622,924 | $ 1,875,780
Tier 1 Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 8.00% | 8.00%
Common Equity Tier 1 Capital. To Be Well Capitalized Under Prompt Corrective Action, Amount | $ 2,131,126 | $ 1,524,071
Common Equity Tier 1 Capital. To Be Well Capitalized Under Prompt Corrective Action, Ratio | 6.50% | 6.50%
Leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 1,550,809 | $ 1,385,508
Leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 5.00% | 5.00%

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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: 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 2: 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 3: 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 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: 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 2: 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 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 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: 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 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: 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 + Details
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