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Summary Of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
entity
Dec. 31, 2013
Significant Accounting Policies [Line Items]    
Federal Home Loan Bank Stock, at cost $ 3,908,000us-gaap_FederalHomeLoanBankStock $ 2,705,000us-gaap_FederalHomeLoanBankStock
Cash surrender value of BOLI 12,200,000us-gaap_CashSurrenderValueOfLifeInsurance 11,900,000us-gaap_CashSurrenderValueOfLifeInsurance
Goodwill $ 2,820,000us-gaap_Goodwill $ 2,820,000us-gaap_Goodwill
Number of insurance carriers 15sbbx_NumberOfInsuranceCarriers  
Percentage of insurance revenue using direct billing 90.00%sbbx_PercentageOfInsuranceRevenueUsingDirectBilling  
Sussex County, New Jersey [Member]    
Significant Accounting Policies [Line Items]    
Banking offices 8sbbx_BankingLocations
/ us-gaap_StatementGeographicalAxis
= sbbx_SussexCountyNewJerseyMember		  
Warren County, New Jersey [Member]    
Significant Accounting Policies [Line Items]    
Banking offices 1sbbx_BankingLocations
/ us-gaap_StatementGeographicalAxis
= sbbx_WarrenCountyNewJerseyMember		  
Orange County, New York [Member]    
Significant Accounting Policies [Line Items]    
Banking offices 1sbbx_BankingLocations
/ us-gaap_StatementGeographicalAxis
= sbbx_OrangeCountyNewYorkMember