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Borrowings (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Variable rate addition 1.44%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 1.68%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Long-term borrowings $ 46,000,000us-gaap_LongTermDebt $ 41,000,000us-gaap_LongTermDebt
Atlantic Central Bankers BAnk [Member]    
Debt Instrument [Line Items]    
Line of credit, maximum borrowing capacity 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= sbbx_AtlanticCentralBankersBankMember
 
Line of credit facility, current borrowing capacity 10,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= sbbx_AtlanticCentralBankersBankMember
 
Federal Home Loan Bank Borrowings [Member]    
Debt Instrument [Line Items]    
Line of credit, maximum borrowing capacity 124,300,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
 
Pledged assets 168,300,000us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
 
Line of credit facility, current borrowing capacity 58,200,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
 
Line of credit facility, overnight advances 23,500,000sbbx_LineOfCreditFacilityOvernightAdvances
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
 
Federal Home Loan Bank Borrowings [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Variable rate addition 0.20%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Federal Home Loan Bank Borrowings [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Variable rate addition 0.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Convertible Debt [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 11,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember