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Note 13 - Regulatory Matters - The Company's and Bank's Actual Capital Amounts and Ratios (Details) $ in Thousands | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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CET 1 Capital to risk weighted assets, amount | $ 1,838,024 | $ 1,634,837
CET 1 Capital to risk weighted assets, ratio | 0.1165 | 0.1142
CET 1 Capital to risk weighted assets, for capital adequacy purposes, amount | $ 709,755 | $ 644,441
CET 1 capital to risk weighted assets, for capital adequacy purposes, ratio | 4.50% | 4.50%
Tier 1 capital to risk weighted assets, amount | $ 1,838,524 | $ 1,635,337
Tier 1 capital to risk weighted assets, ratio | 0.1166 | 0.1142
Tier 1 capital to risk weighted assets, for capital adequacy purposes, amount | $ 946,340 | $ 859,255
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio | 0.06 | 0.06
Total capital to risk weighted assets, amount | $ 2,038,579 | $ 1,847,146
Total capital to risk weighted assets, ratio | 0.1293 | 0.129
Total capital to risk weighted assets, for capital adequacy purposes, amount | $ 1,261,787 | $ 1,145,673
Total capital to risk weighted assets, for capital adequacy purposes, ratio | 0.08 | 0.08
Tier 1 capital to average assets, amount | $ 1,838,524 | $ 1,635,337
Tier 1 capital to average assets, ratio | 0.1026 | 0.0959
Tier 1 capital to average assets, for capital adequacy purposes, amount | $ 717,027 | $ 682,238
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 | $ 1,866,335 | $ 1,694,412
CET 1 Capital to risk weighted assets, ratio | 0.1183 | 0.1183
CET 1 Capital to risk weighted assets, for capital adequacy purposes, amount | $ 709,698 | $ 644,402
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 | $ 1,025,119 | $ 930,803
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 | $ 1,866,835 | $ 1,694,912
Tier 1 capital to risk weighted assets, ratio | 0.1184 | 0.1184
Tier 1 capital to risk weighted assets, for capital adequacy purposes, amount | $ 946,264 | $ 859,203
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 | $ 1,261,685 | $ 1,145,604
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 | $ 2,039,090 | $ 1,859,978
Total capital to risk weighted assets, ratio | 0.1293 | 0.1299
Total capital to risk weighted assets, for capital adequacy purposes, amount | $ 1,261,685 | $ 1,145,604
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 | $ 1,577,107 | $ 1,432,005
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 | $ 1,866,835 | $ 1,694,912
Tier 1 capital to average assets, ratio | 0.1041 | 0.0994
Tier 1 capital to average assets, for capital adequacy purposes, amount | $ 716,995 | $ 682,223
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 | $ 896,244 | $ 852,779
Tier 1 capital to average assets, to be well capitalized under 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/1943274/2147477270/942-505-50-1 + Details
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