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Regulatory Capital and Restrictions - Schedule of Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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First Horizon National Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital, Actual Amount | $ 3,940,117 | $ 3,703,754
Total Capital, Actual Ratio | 11.94% | 11.10%
Tier 1 Capital, Actual Amount | $ 3,565,373 | $ 3,281,478
Tier 1 Capital, Actual Ratio | 10.80% | 9.83%
Common Equity Tier 1 Capital, Actual Amount | $ 3,223,702 | $ 2,962,155
Common Equity Tier 1 Capital, Actual Ratio | 9.77% | 8.88%
Leverage, Actual Amount | $ 3,565,373 | $ 3,281,478
Leverage, Actual Ratio | 9.09% | 10.31%
Total Capital, Capital Adequacy Purposes, Amount | $ 2,640,208 | $ 2,669,910
Total Capital, Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,980,156 | $ 2,002,433
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,485,117 | $ 1,501,824
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 1,568,870 | $ 1,272,990
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 | $ 3,689,180 | $ 3,520,670
Total Capital, Actual Ratio | 11.32% | 10.74%
Tier 1 Capital, Actual Amount | $ 3,492,541 | $ 3,317,684
Tier 1 Capital, Actual Ratio | 10.72% | 10.12%
Common Equity Tier 1 Capital, Actual Amount | $ 3,197,725 | $ 3,041,420
Common Equity Tier 1 Capital, Actual Ratio | 9.81% | 9.28%
Leverage, Actual Amount | $ 3,492,541 | $ 3,317,684
Leverage, Actual Ratio | 9.10% | 10.70%
Total Capital, Capital Adequacy Purposes, Amount | $ 2,607,406 | $ 2,622,924
Total Capital, Capital Adequacy Purposes, Ratio | 8.00% | 8.00%
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,955,555 | $ 1,967,193
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 6.00% | 6.00%
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 1,466,666 | $ 1,475,395
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 1,535,279 | $ 1,240,647
Leverage, Capital Adequacy Purposes, Ratio | 4.00% | 4.00%
Total Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 3,259,258 | $ 3,278,655
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 | $ 2,607,406 | $ 2,622,924
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 | $ 2,118,518 | $ 2,131,126
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 | $ 1,919,099 | $ 1,550,809
Leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 5.00% | 5.00%

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