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Stockholders' Equity - Company's Significant Subsidiaries (Details) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Simmons First National Corporation |  |
Class of Stock [Line Items] |  |
Capital | $ 2,603,142 | $ 2,356,982
Capital to Risk Weighted Assets | 0.167 | 0.168
Capital Required for Capital Adequacy | $ 1,247,014 | $ 1,122,372
Capital Required for Capital Adequacy to Risk Weighted Assets | 0.080 | 0.080
Tier One Risk Based Capital | $ 2,147,158 | $ 1,884,562
Tier One Risk Based Capital to Risk Weighted Assets | 0.138 | 0.134
Tier One Risk Based Capital Required for Capital Adequacy | $ 933,547 | $ 843,834
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 0.060 | 0.060
Common Equity Tier One Capital | $ 2,147,158 | $ 1,883,795
Common Equity Tier One Capital Ratio | 0.138 | 0.134
Common Equity Tier One Capital Required for Capital Adequacy | $ 700,160 | $ 632,618
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% | 4.50%
Tier One Leverage Capital | $ 2,147,158 | $ 1,884,562
Tier One Leverage Capital to Average Assets | 0.091 | 0.091
Tier One Leverage Capital Required for Capital Adequacy | $ 943,806 | $ 828,379
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.040 | 0.040
Simmons Bank |  |
Class of Stock [Line Items] |  |
Capital | $ 2,389,704 | $ 2,136,253
Capital to Risk Weighted Assets | 0.154 | 0.153
Capital Required for Capital Adequacy | $ 1,241,405 | $ 1,116,995
Capital Required for Capital Adequacy to Risk Weighted Assets | 0.080 | 0.080
Capital Required to be Well Capitalized | $ 1,551,756 | $ 1,396,244
Capital Required to be Well Capitalized to Risk Weighted Assets | 0.100 | 0.100
Tier One Risk Based Capital | $ 2,317,855 | $ 2,046,711
Tier One Risk Based Capital to Risk Weighted Assets | 0.150 | 0.146
Tier One Risk Based Capital Required for Capital Adequacy | $ 927,142 | $ 841,114
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 | $ 1,236,189 | $ 1,121,485
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.080 | 0.080
Common Equity Tier One Capital | $ 2,317,855 | $ 2,046,711
Common Equity Tier One Capital Ratio | 0.150 | 0.146
Common Equity Tier One Capital Required for Capital Adequacy | $ 695,357 | $ 630,836
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 | $ 1,004,404 | $ 911,207
Common Equity Tier One Capital Required to Be Well Capitalized to Risk Weighted Assets | 6.50% | 6.50%
Tier One Leverage Capital | $ 2,317,855 | $ 2,046,711
Tier One Leverage Capital to Average Assets | 0.098 | 0.099
Tier One Leverage Capital Required for Capital Adequacy | $ 946,063 | $ 826,954
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.040 | 0.040
Tier One Leverage Capital Required to be Well Capitalized | $ 1,182,579 | $ 1,033,692
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.050 | 0.050

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