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Note 14 - Regulatory Matters - The Company's and Bank's Actual Capital Amounts and Ratios (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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CET 1 Capital to risk weighted assets, amount | $ 1,473,885 | $ 1,326,035
CET 1 Capital to risk weighted assets, ratio | 0.1091 | 0.0955
CET 1 Capital to risk weighted assets, for capital adequacy purposes, amount | $ 607,690 | $ 624,986
CET 1 capital to risk weighted assets, for capital adequacy purposes, ratio | 4.50% | 4.50%
Tier 1 capital to risk weighted assets, amount | $ 1,474,385 | $ 1,326,535
Tier 1 capital to risk weighted assets, ratio | 0.1092 | 0.0995
Tier 1 capital to risk weighted assets, for capital adequacy purposes, amount | $ 810,253 | $ 833,315
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio | 0.06 | 0.06
Total capital to risk weighted assets, amount | $ 1,681,028 | $ 1,532,134
Total capital to risk weighted assets, ratio | 0.1245 | 0.1103
Total capital to risk weighted assets, for capital adequacy purposes, amount | $ 1,080,338 | $ 1,111,086
Total capital to risk weighted assets, for capital adequacy purposes, ratio | 0.08 | 0.08
Tier 1 capital to average assets, amount | $ 1,474,385 | $ 1,326,535
Tier 1 capital to average assets, ratio | 0.0912 | 0.0929
Tier 1 capital to average assets, for capital adequacy purposes, amount | $ 646,710 | $ 570,960
Tier 1 capital to average assets, for capital adequacy purposes, ratio | 0.04 | 0.04
Servisfirst Bank [Member] |  |
CET 1 Capital to risk weighted assets, amount | $ 1,535,757 | $ 1,385,697
CET 1 Capital to risk weighted assets, ratio | 0.1137 | 0.0998
CET 1 Capital to risk weighted assets, for capital adequacy purposes, amount | $ 607,665 | $ 624,942
CET 1 capital to risk weighted assets, for capital adequacy purposes, ratio | 4.50% | 4.50%
CET 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, amount | $ 877,738 | $ 902,694
CET 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, ratio | 6.50% | 6.50%
Tier 1 capital to risk weighted assets, amount | $ 1,536,257 | $ 1,386,197
Tier 1 capital to risk weighted assets, ratio | 0.1138 | 0.0998
Tier 1 capital to risk weighted assets, for capital adequacy purposes, amount | $ 810,220 | $ 833,256
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio | 0.06 | 0.06
Tier 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, amount | $ 1,080,293 | $ 1,111,008
Tier 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, ratio | 0.08 | 0.08
Total capital to risk weighted assets, amount | $ 1,690,149 | $ 1,533,069
Total capital to risk weighted assets, ratio | 0.1252 | 0.1104
Total capital to risk weighted assets, for capital adequacy purposes, amount | $ 1,080,293 | $ 1,111,008
Total capital to risk weighted assets, for capital adequacy purposes, ratio | 0.08 | 0.08
Total capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, amount | $ 1,350,366 | $ 1,388,760
Total capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, ratio | 0.10 | 0.10
Tier 1 capital to average assets, amount | $ 1,536,257 | $ 1,386,197
Tier 1 capital to average assets, ratio | 0.095 | 0.0971
Tier 1 capital to average assets, for capital adequacy purposes, amount | $ 646,675 | $ 570,924
Tier 1 capital to average assets, for capital adequacy purposes, ratio | 0.04 | 0.04
Tier 1 capital to average assets, to be well capitalized under prompt corrective action provisions, amount | $ 808,343 | $ 713,656
Tier 1 capital to average assets, to be well capitalized uner prompt corrective action provisions, ratio | 0.05 | 0.05

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- Definition The minimum CET One Capital Ratio (CET one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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