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Loans And Allowance For Loan Losses (Recorded Investment And The Number Of Loans Modified As Troubled Debt Restructuring Which Subsequently Defaulted) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
loan
Dec. 31, 2013
loan
Financing Receivable, Modifications [Line Items]    
Number of Contracts 0oksb_FinancingReceivableModificationNumberOfContracts  
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Contracts   1oksb_FinancingReceivableModificationNumberOfContracts
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Recorded Investment   $ 0.2oksb_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember