Annual report pursuant to Section 13 and 15(d)

OTHER OPERATING INCOME AND EXPENSES (Other Operating Income And Expense Included In Noninterest Income And Noninterest Expense) (Detail)

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OTHER OPERATING INCOME AND EXPENSES (Other Operating Income And Expense Included In Noninterest Income And Noninterest Expense) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Operating Income      
(Loss) gain on sale of other real estate owned $ (413)us-gaap_GainsLossesOnSalesOfOtherRealEstate $ (159)us-gaap_GainsLossesOnSalesOfOtherRealEstate $ (105)us-gaap_GainsLossesOnSalesOfOtherRealEstate
Credit card income 2,041sfbs_CreditCardIncome 1,425sfbs_CreditCardIncome 1,064sfbs_CreditCardIncome
Other 1,006us-gaap_OtherIncome 878us-gaap_OtherIncome 744us-gaap_OtherIncome
Other Operating Income 2,634us-gaap_OtherOperatingIncome 2,144us-gaap_OtherOperatingIncome 1,703us-gaap_OtherOperatingIncome
Other Operating Expenses      
Postage 264us-gaap_PostageExpense 195us-gaap_PostageExpense 159us-gaap_PostageExpense
Telephone 555us-gaap_UtilitiesCosts 465us-gaap_UtilitiesCosts 385us-gaap_UtilitiesCosts
Data processing 3,126us-gaap_InformationTechnologyAndDataProcessing 2,535us-gaap_InformationTechnologyAndDataProcessing 2,202us-gaap_InformationTechnologyAndDataProcessing
Other loan expenses 1,296us-gaap_LoanProcessingFee 1,882us-gaap_LoanProcessingFee 2,836us-gaap_LoanProcessingFee
Supplies 399us-gaap_SuppliesAndPostageExpense 380us-gaap_SuppliesAndPostageExpense 320us-gaap_SuppliesAndPostageExpense
Customer and public relations 959sfbs_CustomerAndPublicRelations 838sfbs_CustomerAndPublicRelations 791sfbs_CustomerAndPublicRelations
Marketing 477us-gaap_MarketingExpense 532us-gaap_MarketingExpense 454us-gaap_MarketingExpense
Sales and use tax 259sfbs_SalesAndUseTax 309sfbs_SalesAndUseTax 198sfbs_SalesAndUseTax
Donations and contributions 466us-gaap_NoninterestExpenseDirectorsFees 370us-gaap_NoninterestExpenseDirectorsFees 482us-gaap_NoninterestExpenseDirectorsFees
Directors fees 364sfbs_PrepaymentPenaltiesFhlbAdvances 341sfbs_PrepaymentPenaltiesFhlbAdvances 286sfbs_PrepaymentPenaltiesFhlbAdvances
Write-down investment in tax credit partnerships 2,552us-gaap_InvestmentTaxCredit 356us-gaap_InvestmentTaxCredit 330us-gaap_InvestmentTaxCredit
Other operational losses 575sfbs_OtherOperationalLosses 113sfbs_OtherOperationalLosses 22sfbs_OtherOperationalLosses
Other 3,680us-gaap_OtherExpenses 2,613us-gaap_OtherExpenses 2,257us-gaap_OtherExpenses
Other Operating Expenses $ 14,972sfbs_OtherOperatingExpenses $ 10,929sfbs_OtherOperatingExpenses $ 10,722sfbs_OtherOperatingExpenses