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Taxes On Income (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations 37.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective tax rate 37.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Operating Loss Carryforward Expiration Date 2031 2031  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax   $ 2,500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Net deferred tax assets 14,094,000us-gaap_DeferredTaxAssetsLiabilitiesNet 24,937,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Internal Revenue Service (IRS) [Member]      
Federal net operating loss carryforward   10,700,000us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		  
State and Local Jurisdiction [Member]      
Federal net operating loss carryforward 35,800,000us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 53,100,000us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Operating Loss Carryforward Expiration Date   2031  
State And Local Jurisdiction Second Expiration [Member]      
Federal net operating loss carryforward   $ 600,000us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward
/ us-gaap_IncomeTaxAuthorityAxis
= oksb_StateAndLocalJurisdictionSecondExpirationMember		  
Operating Loss Carryforward Expiration Date   2021