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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Net interest income from external sources $ 18,006us-gaap_InterestIncomeExpenseNet $ 16,441us-gaap_InterestIncomeExpenseNet
Other income from external sources 5,961us-gaap_NoninterestIncome 6,093us-gaap_NoninterestIncome
Depreciation and amortization 797us-gaap_DepreciationDepletionAndAmortization 669us-gaap_DepreciationDepletionAndAmortization
(Loss) Income before income taxes 3,601us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 1,561us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (benefit) expense 1,001us-gaap_IncomeTaxExpenseBenefit [1] 133us-gaap_IncomeTaxExpenseBenefit [1]
Total assets 595,915us-gaap_Assets 533,911us-gaap_Assets
Statutory tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Subsidiary [Member]    
Segment Reporting Information [Line Items]    
Statutory tax rate 40.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sbbx_SubsidiaryMember
40.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sbbx_SubsidiaryMember
Banking And Financial Services [Member]    
Segment Reporting Information [Line Items]    
Net interest income from external sources 18,004us-gaap_InterestIncomeExpenseNet
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
16,438us-gaap_InterestIncomeExpenseNet
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
Other income from external sources 2,787us-gaap_NoninterestIncome
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
3,161us-gaap_NoninterestIncome
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
Depreciation and amortization 776us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
656us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
(Loss) Income before income taxes 3,100us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
1,123us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
Income tax (benefit) expense 801us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
[1] (42)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
[1]
Total assets 591,192us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
530,925us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_BankingAndFinancialServicesMember
Insurance Services [Member]    
Segment Reporting Information [Line Items]    
Net interest income from external sources 2us-gaap_InterestIncomeExpenseNet
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
3us-gaap_InterestIncomeExpenseNet
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
Other income from external sources 3,174us-gaap_NoninterestIncome
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
2,932us-gaap_NoninterestIncome
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
Depreciation and amortization 21us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
13us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
(Loss) Income before income taxes 501us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
438us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
Income tax (benefit) expense 200us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
[1] 175us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
[1]
Total assets $ 4,723us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
$ 2,986us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sbbx_InsuranceServicesMember
[1] Calculated at statutory tax rate of 40%.