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EMPLOYEE AND DIRECTOR BENEFITS (Additional Information) (Detail) (USD $)
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0 Months Ended |
3 Months Ended |
12 Months Ended |
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May 14, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Jun. 30, 2009
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Sep. 30, 2008
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share based compensation |
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$ 3,681,000us-gaap_ShareBasedCompensation
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$ 1,205,000us-gaap_ShareBasedCompensation
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$ 1,049,000us-gaap_ShareBasedCompensation
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| Shares available for grant |
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2,019,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
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$ 3.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 3.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |
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1,218,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |
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2 years 3 months 18 days
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| Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total |
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235,500us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
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| Non Routine Expenses |
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1,800,000sfbs_NonRoutineExpenses
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703,000sfbs_NonRoutineExpenses
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |
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2,025,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
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705,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
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404,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
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60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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| Warrants Exercisable |
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211,500sfbs_WarrantsExercisable
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120,000sfbs_WarrantsExercisable
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60,000sfbs_WarrantsExercisable
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| Additional Contribution |
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1.00%sfbs_AdditionalContribution
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4.00%sfbs_AdditionalContribution
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| Postemployment Benefits, Period Expense |
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811,000us-gaap_PostemploymentBenefitsPeriodExpense
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878,000us-gaap_PostemploymentBenefitsPeriodExpense
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1,167,000us-gaap_PostemploymentBenefitsPeriodExpense
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| Class of Warrant or Right, Number of Securities Called by Warrants or Rights |
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180,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
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| Class of Warrant or Right, Exercise Price of Warrants or Rights |
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$ 3.333us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
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| Subordinated Borrowing, Interest Rate |
8.25%us-gaap_SubordinatedBorrowingInterestRate
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| Preferred Securities [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrants Exercisable |
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13,500sfbs_WarrantsExercisable
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfbs_PreferredSecuritiesMember
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| Class of Warrant or Right, Number of Securities Called by Warrants or Rights |
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45,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfbs_PreferredSecuritiesMember
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| Class of Warrant or Right, Exercise Price of Warrants or Rights |
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$ 8.333us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfbs_PreferredSecuritiesMember
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$ 8.333us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sfbs_PreferredSecuritiesMember
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| Restricted Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |
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852,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
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| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |
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1 year 8 months 12 days
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| Plan 2005 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares available for grant |
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1,575,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= sfbs_Plan2005Member
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| Plan 2006 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares available for grant |
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3,075,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= sfbs_Plan2006Member
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| Plan 2009 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share based compensation |
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2,775,000us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= sfbs_Plan2009Member
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| Shares available for grant |
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1,275,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= sfbs_Plan2009Member
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| Additional Contribution [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Postemployment Benefits, Period Expense |
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$ 200,000us-gaap_PostemploymentBenefitsPeriodExpense
/ sfbs_AdditionalContributionAxis
= sfbs_AdditionalContributionMember
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$ 576,000us-gaap_PostemploymentBenefitsPeriodExpense
/ sfbs_AdditionalContributionAxis
= sfbs_AdditionalContributionMember
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