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Note 17 - Commitments and Contingencies - Summary of Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Commitments to extend credit | $ 3,552,958 | $ 3,410,283 | $ 4,230,485
Credit card arrangements | 366,843 | 381,524 | 368,749
Standby letters of credit and financial guarantees | 125,147 | 86,065 | 67,285
Total | $ 4,044,948 | $ 3,877,872 | $ 4,666,519

X
- Definition The minimum amount the entity agreed to spend under commitment to extend credit. + References No definition available. + Details
Name: | sfbs_CommitmentsToExtendCredit
Namespace Prefix: | sfbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under commitment to credit card arrangement. + References No definition available. + Details
Name: | sfbs_CreditCardArrangements
Namespace Prefix: | sfbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity committed to spend for standby letters of credit and financial guarantees + References No definition available. + Details
Name: | sfbs_StandbyLettersOfCreditAndFinancialGuarantees
Namespace Prefix: | sfbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant