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Stockholders' Equity - Company's Significant Subsidiaries (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | ---
Class of Stock [Line Items] |  |
Capital Required to be Well Capitalized to Risk Weighted Assets | 0.10 |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.08 |
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.05 |
Simmons First National Corporation |  |
Class of Stock [Line Items] |  |
Capital | $ 2,948,490 | $ 2,603,142
Capital to Risk Weighted Assets | 0.142 | 0.167
Capital Required for Capital Adequacy | $ 1,661,121 | $ 1,247,014
Capital Required for Capital Adequacy to Risk Weighted Assets | 0.080 | 0.080
Tier One Risk Based Capital | $ 2,466,874 | $ 2,147,158
Tier One Risk Based Capital to Risk Weighted Assets | 0.119 | 0.138
Tier One Risk Based Capital Required for Capital Adequacy | $ 1,243,802 | $ 933,547
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 0.060 | 0.060
Common Equity Tier One Capital | $ 2,466,874 | $ 2,147,158
Common Equity Tier One Capital Ratio | 0.119 | 0.138
Common Equity Tier One Capital Required for Capital Adequacy | $ 932,852 | $ 700,160
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% | 4.50%
Tier One Leverage Capital | $ 2,466,874 | $ 2,147,158
Tier One Leverage Capital to Average Assets | 0.093 | 0.091
Tier One Leverage Capital Required for Capital Adequacy | $ 1,061,021 | $ 943,806
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.040 | 0.040
Simmons Bank |  |
Class of Stock [Line Items] |  |
Capital | $ 2,743,625 | $ 2,389,704
Capital to Risk Weighted Assets | 0.133 | 0.154
Capital Required for Capital Adequacy | $ 1,650,301 | $ 1,241,405
Capital Required for Capital Adequacy to Risk Weighted Assets | 0.080 | 0.080
Capital Required to be Well Capitalized | $ 2,062,876 | $ 1,551,756
Capital Required to be Well Capitalized to Risk Weighted Assets | 0.100 | 0.100
Tier One Risk Based Capital | $ 2,628,002 | $ 2,317,855
Tier One Risk Based Capital to Risk Weighted Assets | 0.127 | 0.150
Tier One Risk Based Capital Required for Capital Adequacy | $ 1,241,576 | $ 927,142
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 | $ 1,655,434 | $ 1,236,189
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.080 | 0.080
Common Equity Tier One Capital | $ 2,628,002 | $ 2,317,855
Common Equity Tier One Capital Ratio | 0.127 | 0.150
Common Equity Tier One Capital Required for Capital Adequacy | $ 931,182 | $ 695,357
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 | $ 1,345,040 | $ 1,004,404
Common Equity Tier One Capital Required to Be Well Capitalized to Risk Weighted Assets | 6.50% | 6.50%
Tier One Leverage Capital | $ 2,628,002 | $ 2,317,855
Tier One Leverage Capital to Average Assets | 0.100 | 0.098
Tier One Leverage Capital Required for Capital Adequacy | $ 1,051,201 | $ 946,063
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.040 | 0.040
Tier One Leverage Capital Required to be Well Capitalized | $ 1,314,001 | $ 1,182,579
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.050 | 0.050

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