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Note 16 - Income Taxes (Details Textual) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 450,000 | $ 0
Unrecognized Tax Benefits, Net of Benefit on State | 1,653,000 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 1,653,000 | $ 0

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- Definition Amount of unrecognized tax benefits, net of benefit on state. + References No definition available. + Details
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Namespace Prefix: | sfbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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