LOANS (Details Of Loans) (Detail) (USD $) In Thousands, unless otherwise specified
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Accounts Notes and Loans Receivable [Line Items] |
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Total Loans |
$ 3,607,852us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
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$ 3,359,858us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
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[1] |
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Less allowance for loan losses |
(37,356)us-gaap_LoansAndLeasesReceivableAllowance
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(35,629)us-gaap_LoansAndLeasesReceivableAllowance
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[1] |
(31,728)us-gaap_LoansAndLeasesReceivableAllowance
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(30,663)us-gaap_LoansAndLeasesReceivableAllowance
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Net Loans |
3,570,496us-gaap_LoansAndLeasesReceivableNetReportedAmount
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3,324,229us-gaap_LoansAndLeasesReceivableNetReportedAmount
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[1] |
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Total Loans |
100.00%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage
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100.00%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage
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Commercial Financial and Agricultural Financing Receivable [Member] |
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Accounts Notes and Loans Receivable [Line Items] |
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Total Loans |
1,543,531us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialFinancialAndAgriculturalFinancingReceivableMember
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1,495,092us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialFinancialAndAgriculturalFinancingReceivableMember
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Less allowance for loan losses |
(16,857)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialFinancialAndAgriculturalFinancingReceivableMember
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(16,079)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialFinancialAndAgriculturalFinancingReceivableMember
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(13,505)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialFinancialAndAgriculturalFinancingReceivableMember
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(13,576)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialFinancialAndAgriculturalFinancingReceivableMember
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Total Loans |
42.78%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialFinancialAndAgriculturalFinancingReceivableMember
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44.50%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialFinancialAndAgriculturalFinancingReceivableMember
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Commercial Real Estate Construction Financing Receivable [Member] |
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Accounts Notes and Loans Receivable [Line Items] |
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Total Loans |
219,005us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
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208,769us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
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Less allowance for loan losses |
(5,889)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
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(6,395)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
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(6,341)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
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(6,078)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
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Total Loans |
6.07%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
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6.21%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
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Commercial Mortgage Loans Owner Occupied [Member] |
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Accounts Notes and Loans Receivable [Line Items] |
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Total Loans |
869,724us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialMortgageLoansOwnerOccupiedMember
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793,917us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialMortgageLoansOwnerOccupiedMember
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Total Loans |
24.11%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialMortgageLoansOwnerOccupiedMember
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23.63%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_CommercialMortgageLoansOwnerOccupiedMember
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One To Four Family Mortgage Loans [Member] |
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Accounts Notes and Loans Receivable [Line Items] |
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Total Loans |
375,770us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_OneToFourFamilyMortgageLoansMember
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333,455us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_OneToFourFamilyMortgageLoansMember
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Total Loans |
10.42%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_OneToFourFamilyMortgageLoansMember
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9.92%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_OneToFourFamilyMortgageLoansMember
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Other Real Estate Mortgage Loans [Member] |
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Accounts Notes and Loans Receivable [Line Items] |
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Total Loans |
545,668us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_OtherRealEstateMortgageLoansMember
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471,363us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_OtherRealEstateMortgageLoansMember
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Total Loans |
15.12%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_OtherRealEstateMortgageLoansMember
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14.03%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_OtherRealEstateMortgageLoansMember
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Residential Real Estate Mortgage Loans [Member] |
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Accounts Notes and Loans Receivable [Line Items] |
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Total Loans |
1,791,162us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_ResidentialRealEstateMortgageLoansMember
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1,598,735us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_ResidentialRealEstateMortgageLoansMember
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Less allowance for loan losses |
(13,546)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_ResidentialRealEstateMortgageLoansMember
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(12,112)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_ResidentialRealEstateMortgageLoansMember
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(10,837)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_ResidentialRealEstateMortgageLoansMember
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(10,065)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_ResidentialRealEstateMortgageLoansMember
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Total Loans |
49.65%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_ResidentialRealEstateMortgageLoansMember
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47.58%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = sfbs_ResidentialRealEstateMortgageLoansMember
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Consumer Portfolio Segment [Member] |
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Accounts Notes and Loans Receivable [Line Items] |
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Total Loans |
54,154us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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57,262us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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Less allowance for loan losses |
$ (1,064)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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$ (1,043)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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$ (1,045)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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$ (944)us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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Total Loans |
1.50%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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1.71%sfbs_LoansAndLeasesReceivableNetOfDeferredIncomePercentage / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
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