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Loans And Allowance For Loan Losses (Recorded Investment In Loans On Nonaccrual Status) (Details) (Noncovered [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual loans $ 9,276us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 19,819us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Real Estate Mortgage [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual loans 2,195us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember		 7,766us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember
Real Estate Mortgage [Member] | One-To-Four Family Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual loans 1,100us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember		 513us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgageLoansOnRealEstateMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember
Real Estate Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual loans 73us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember		 2,721us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual loans 5,907us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember		 8,769us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember
Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total nonaccrual loans $ 1us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember		 $ 50us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
/ oksb_LoanLossSharingCoverageAxis
= oksb_LoanLossSharingNonCoveredMember