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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Actual Capital Amounts and Ratios | The Company’s and the subsidiary banks’ actual capital amounts and ratios are presented in the following table.
| Actual |  | Minimum For Capital Adequacy Purposes |  | To Be Well Capitalized Under Prompt Corrective Action Provision
(In thousands) | Amount |  | Ratio (%) |  | Amount |  | Ratio (%) |  | Amount |  | Ratio (%)
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |
Total Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation | $ | 2,356,982 |  |  | 16.8 |  |  | $ | 1,122,372 |  |  | 8.0 |  |  | N/A |  |
Simmons Bank | 2,136,253 |  |  | 15.3 |  |  | 1,116,995 |  |  | 8.0 |  |  | 1,396,244 |  |  | 10.0 |
Tier 1 Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation | 1,884,562 |  |  | 13.4 |  |  | 843,834 |  |  | 6.0 |  |  | N/A |  |
Simmons Bank | 2,046,711 |  |  | 14.6 |  |  | 841,114 |  |  | 6.0 |  |  | 1,121,485 |  |  | 8.0 |
Common Equity Tier 1 Capital Ratio |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation | 1,883,795 |  |  | 13.4 |  |  | 632,618 |  |  | 4.5 |  |  | N/A |  |
Simmons Bank | 2,046,711 |  |  | 14.6 |  |  | 630,836 |  |  | 4.5 |  |  | 911,207 |  |  | 6.5 |
Tier 1 Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation | 1,884,562 |  |  | 9.1 |  |  | 828,379 |  |  | 4.0 |  |  | N/A |  |
Simmons Bank | 2,046,711 |  |  | 9.9 |  |  | 826,954 |  |  | 4.0 |  |  | 1,033,692 |  |  | 5.0 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
Total Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation | $ | 2,272,858 |  |  | 13.7 |  |  | $ | 1,327,216 |  |  | 8.0 |  |  | N/A |  |
Simmons Bank | 1,852,880 |  |  | 12.9 |  |  | 1,149,073 |  |  | 8.0 |  |  | 1,436,341 |  |  | 10.0 |
Landmark Bank (1) | 291,378 |  |  | 13.9 |  |  | 167,700 |  |  | 8.0 |  |  | 209,624 |  |  | 10.0 |
Tier 1 Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation | 1,807,954 |  |  | 10.9 |  |  | 995,204 |  |  | 6.0 |  |  | N/A |  |
Simmons Bank | 1,777,602 |  |  | 12.3 |  |  | 867,123 |  |  | 6.0 |  |  | 1,156,164 |  |  | 8.0 |
Landmark Bank (1) | 290,016 |  |  | 13.8 |  |  | 126,094 |  |  | 6.0 |  |  | 168,125 |  |  | 8.0 |
Common Equity Tier 1 Capital Ratio |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation | 1,807,187 |  |  | 10.9 |  |  | 746,086 |  |  | 4.5 |  |  | N/A |  |
Simmons Bank | 1,777,602 |  |  | 12.3 |  |  | 650,342 |  |  | 4.5 |  |  | 939,383 |  |  | 6.5 |
Landmark Bank (1) | 270,016 |  |  | 12.9 |  |  | 94,192 |  |  | 4.5 |  |  | 136,055 |  |  | 6.5 |
Tier 1 Leverage Ratio |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation | 1,807,954 |  |  | 9.6 |  |  | 753,314 |  |  | 4.0 |  |  | N/A |  |
Simmons Bank | 1,777,602 |  |  | 10.7 |  |  | 664,524 |  |  | 4.0 |  |  | 830,655 |  |  | 5.0 |
Landmark Bank (1) | 290,016 |  |  | 8.8 |  |  | 131,825 |  |  | 4.0 |  |  | 164,782 |  |  | 5.0 |
______________________ (1) Landmark Bank was merged into Simmons Bank on February 14, 2020.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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://www.xbrl.org/2003/role/disclosureRef -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 + Details
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