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Stockholders' Equity - Company's Significant Subsidiaries (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Simmons First National Corporation |  |
Capital | $ 2,356,982 | $ 2,272,858
Capital to Risk Weighted Assets | 0.168 | 0.137
Capital Required for Capital Adequacy | $ 1,122,372 | $ 1,327,216
Capital Required for Capital Adequacy to Risk Weighted Assets | 0.080 | 0.080
Tier One Risk Based Capital | $ 1,884,562 | $ 1,807,954
Tier One Risk Based Capital to Risk Weighted Assets | 0.134 | 0.109
Tier One Risk Based Capital Required for Capital Adequacy | $ 843,834 | $ 995,204
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 0.060 | 0.060
Common Equity Tier One Capital | $ 1,883,795 | $ 1,807,187
Common Equity Tier One Capital Ratio | 0.134 | 0.109
Common Equity Tier One Capital Required for Capital Adequacy | $ 632,618 | $ 746,086
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% | 4.50%
Tier One Leverage Capital | $ 1,884,562 | $ 1,807,954
Tier One Leverage Capital to Average Assets | 0.091 | 0.096
Tier One Leverage Capital Required for Capital Adequacy | $ 828,379 | $ 753,314
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.040 | 0.040
Simmons Bank |  |
Capital | $ 2,136,253 | $ 1,852,880
Capital to Risk Weighted Assets | 0.153 | 0.129
Capital Required for Capital Adequacy | $ 1,116,995 | $ 1,149,073
Capital Required for Capital Adequacy to Risk Weighted Assets | 0.080 | 0.080
Capital Required to be Well Capitalized | $ 1,396,244 | $ 1,436,341
Capital Required to be Well Capitalized to Risk Weighted Assets | 0.100 | 0.100
Tier One Risk Based Capital | $ 2,046,711 | $ 1,777,602
Tier One Risk Based Capital to Risk Weighted Assets | 0.146 | 0.123
Tier One Risk Based Capital Required for Capital Adequacy | $ 841,114 | $ 867,123
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 0.060 | 0.060
Tier One Risk Based Capital Required to be Well Capitalized | $ 1,121,485 | $ 1,156,164
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.080 | 0.080
Common Equity Tier One Capital | $ 2,046,711 | $ 1,777,602
Common Equity Tier One Capital Ratio | 0.146 | 0.123
Common Equity Tier One Capital Required for Capital Adequacy | $ 630,836 | $ 650,342
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% | 4.50%
Common Equity Tier One Capital Required to be Well-Capitalized | $ 911,207 | $ 939,383
Common Equity Tier One Capital Required to Be Well Capitalized to Risk Weighted Assets | 6.50% | 6.50%
Tier One Leverage Capital | $ 2,046,711 | $ 1,777,602
Tier One Leverage Capital to Average Assets | 0.099 | 0.107
Tier One Leverage Capital Required for Capital Adequacy | $ 826,954 | $ 664,524
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.040 | 0.040
Tier One Leverage Capital Required to be Well Capitalized | $ 1,033,692 | $ 830,655
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.050 | 0.050
Landmark Bank (1) |  |
Capital |  | $ 291,378
Capital to Risk Weighted Assets |  | 0.139
Capital Required for Capital Adequacy |  | $ 167,700
Capital Required for Capital Adequacy to Risk Weighted Assets |  | 0.080
Capital Required to be Well Capitalized |  | $ 209,624
Capital Required to be Well Capitalized to Risk Weighted Assets |  | 0.100
Tier One Risk Based Capital |  | $ 290,016
Tier One Risk Based Capital to Risk Weighted Assets |  | 0.138
Tier One Risk Based Capital Required for Capital Adequacy |  | $ 126,094
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets |  | 0.060
Tier One Risk Based Capital Required to be Well Capitalized |  | $ 168,125
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets |  | 0.080
Common Equity Tier One Capital |  | $ 270,016
Common Equity Tier One Capital Ratio |  | 0.129
Common Equity Tier One Capital Required for Capital Adequacy |  | $ 94,192
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets |  | 4.50%
Common Equity Tier One Capital Required to be Well-Capitalized |  | $ 136,055
Common Equity Tier One Capital Required to Be Well Capitalized to Risk Weighted Assets |  | 6.50%
Tier One Leverage Capital |  | $ 290,016
Tier One Leverage Capital to Average Assets |  | 0.088
Tier One Leverage Capital Required for Capital Adequacy |  | $ 131,825
Tier One Leverage Capital Required for Capital Adequacy to Average Assets |  | 0.040
Tier One Leverage Capital Required to be Well Capitalized |  | $ 164,782
Tier One Leverage Capital Required to be Well Capitalized to Average Assets |  | 0.050

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