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Note 4 - Foreclosed Properties - Summary of Foreclosed Properties (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Balance at beginning of year | $ 995 | $ 248 | $ 1,208
Transfers from loans and capitalized expenses | 4,514 | 933 | 1,046
Foreclosed properties sold | (3,024) | (158) | (2,282)
Write downs and partial liquidations | 46 | (28) | 276
Balance at end of year | $ 2,531 | $ 995 | $ 248

X
- Definition The value of properties held for sale acquired from customer under loan arrangement. + References No definition available. + Details
Name: | sfbs_ForeclosedProperties
Namespace Prefix: | sfbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The Value of foreclosed properties sold during the period. + References No definition available. + Details
Name: | sfbs_ForeclosedPropertiesSold
Namespace Prefix: | sfbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The Value of foreclosed properties transferred from loans and capitalized during the period. + References No definition available. + Details
Name: | sfbs_TransfersFromLoansAndCapitalizedExpenses
Namespace Prefix: | sfbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The value of write down and partial liquidations during the period. + References No definition available. + Details
Name: | sfbs_WritedownsAndPartialLiquidations
Namespace Prefix: | sfbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration