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Loans And Allowance For Loan Losses (Loans Modified As Troubled Debt Restructurings) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
contract
Dec. 31, 2013
contract
Financing Receivable, Modifications [Line Items]    
Number of Modifications 6oksb_FinancingReceivablesModificationsNumberOfContracts 15oksb_FinancingReceivablesModificationsNumberOfContracts
Recorded Investment $ 569oksb_FinancingReceivablesModificationsRecordedInvestment $ 5,584oksb_FinancingReceivablesModificationsRecordedInvestment
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications 1oksb_FinancingReceivablesModificationsNumberOfContracts
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
9oksb_FinancingReceivablesModificationsNumberOfContracts
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Recorded Investment 5oksb_FinancingReceivablesModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
4,732oksb_FinancingReceivablesModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
One-To-Four Family Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications   1oksb_FinancingReceivablesModificationsNumberOfContracts
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
Recorded Investment   68oksb_FinancingReceivablesModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
Commercial [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications 5oksb_FinancingReceivablesModificationsNumberOfContracts
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
5oksb_FinancingReceivablesModificationsNumberOfContracts
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Recorded Investment $ 564oksb_FinancingReceivablesModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
$ 784oksb_FinancingReceivablesModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember