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Regulatory Capital and Restrictions - Schedule of Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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First Horizon National Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital, Actual Amount | $ 4,154,885 | $ 3,940,117
Total Capital, Actual Ratio | 11.22% | 11.94%
Tier 1 Capital, Actual Amount | $ 3,760,450 | $ 3,565,373
Tier 1 Capital, Actual Ratio | 10.15% | 10.80%
Common Equity Tier 1 Capital, Actual Amount | $ 3,408,936 | $ 3,223,702
Common Equity Tier 1 Capital, Actual Ratio | 9.20% | 9.77%
Leverage, Actual Amount | $ 3,760,450 | $ 3,565,373
Leverage, Actual Ratio | 9.04% | 9.09%
Total Capital, Capital Adequacy purposes, Amount | $ 2,963,663 | $ 2,640,208
Total Capital, Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 2,222,747 | $ 1,980,156
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,667,060 | $ 1,485,117
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 1,663,338 | $ 1,568,870
Leverage, Capital Adequacy purposes, Ratio | 4.00% | 4.00%
First Horizon Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital, Actual Amount | $ 3,944,613 | $ 3,689,180
Total Capital, Actual Ratio | 10.77% | 11.32%
Tier 1 Capital, Actual Amount | $ 3,728,683 | $ 3,492,541
Tier 1 Capital, Actual Ratio | 10.18% | 10.72%
Common Equity Tier 1 Capital, Actual Amount | $ 3,433,867 | $ 3,197,725
Common Equity Tier 1 Capital, Actual Ratio | 9.38% | 9.81%
Leverage, Actual Amount | $ 3,728,683 | $ 3,492,541
Leverage, Actual Ratio | 9.12% | 9.10%
Total Capital, Capital Adequacy purposes, Amount | $ 2,930,159 | $ 2,607,406
Total Capital, Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 2,197,620 | $ 1,955,555
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,648,215 | $ 1,466,666
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 1,634,695 | $ 1,535,279
Leverage, Capital Adequacy purposes, Ratio | 4.00% | 4.00%
Total Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 3,662,699 | $ 3,259,258
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 | $ 2,930,159 | $ 2,607,406
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 | $ 2,380,755 | $ 2,118,518
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 | $ 2,043,368 | $ 1,919,099
Leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 5.00% | 5.00%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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