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Loans And Allowance For Loan Losses (Classification Of Risk Category Of Loans, By Classes) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable $ 1,399,991oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered $ 1,270,903oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered $ 1,378,735oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 1,315,226oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,058,203oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 41,979oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 93,231oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 37,507oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 113,979oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 5,279oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 5,490oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		  
Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 752,971oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 752,279oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 889,273oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Commercial Real Estate [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 690,791oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 610,929oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Commercial Real Estate [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 34,287oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 62,932oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Commercial Real Estate [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 27,594oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 77,453oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Commercial Real Estate [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 299oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 965oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		  
One-To-Four Family Residential [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 77,531oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember		 83,988oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember		 75,835oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
One-To-Four Family Residential [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 76,322oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 81,534oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
One-To-Four Family Residential [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 22oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,452oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
One-To-Four Family Residential [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 1,154oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 944oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
One-To-Four Family Residential [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 33oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 58oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		  
Real Estate Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 197,123oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember		 148,494oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember		 134,791oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
Real Estate Construction [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 194,670oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 101,715oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Real Estate Construction [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 420oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 22,576oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Real Estate Construction [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 2,033oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 24,203oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 350,410oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 255,058oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 242,535oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Commercial [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 331,594oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 233,132oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Commercial [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 7,144oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 6,130oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Commercial [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 6,725oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 11,329oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Commercial [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 4,947oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 4,467oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		  
Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 21,956oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember		 31,084oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember		 36,301oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
Other [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 21,849oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 30,893oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Other [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable 106oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 141oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Other [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans receivable $ 1oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 $ 50oksb_LoansAndLeasesReceivableGrossReportedAmountCoveredAndNotCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= oksb_OtherInstallmentsAndConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember