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Parent Company Only Financial (Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Securities available for sale $ 77,976us-gaap_AvailableForSaleSecurities $ 90,676us-gaap_AvailableForSaleSecurities  
Loans 466,332us-gaap_LoansReceivableNet 386,981us-gaap_LoansReceivableNet  
Foreclosed real estate 4,449us-gaap_RealEstateAcquiredThroughForeclosure 2,926us-gaap_RealEstateAcquiredThroughForeclosure  
Total Assets 595,915us-gaap_Assets 533,911us-gaap_Assets  
Junior subordinated debentures 12,887us-gaap_JuniorSubordinatedNotes 12,887us-gaap_JuniorSubordinatedNotes  
Stockholders' equity 51,229us-gaap_StockholdersEquity 46,425us-gaap_StockholdersEquity 40,372us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity 595,915us-gaap_LiabilitiesAndStockholdersEquity 533,911us-gaap_LiabilitiesAndStockholdersEquity  
Parent Company [Member]      
Cash 1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,131us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
979us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Investment in subsidiary 62,016sbbx_ParentCompanyInvestmentInSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
56,772sbbx_ParentCompanyInvestmentInSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Securities available for sale   321us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Accrued interest and other assets 2,635us-gaap_InterestReceivableAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,437us-gaap_InterestReceivableAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total Assets 64,652us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
59,661us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other liabilities 536us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
349us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Junior subordinated debentures 12,887us-gaap_JuniorSubordinatedNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,887us-gaap_JuniorSubordinatedNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Stockholders' equity 51,229us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
46,425us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Total Liabilities and Stockholders' Equity $ 64,652us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 59,661us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember