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Parent Company Only Financial (Statements Of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Net income $ 2,600us-gaap_NetIncomeLoss $ 1,428us-gaap_NetIncomeLoss
Net Cash Provided by Operating Activities 7,734us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 9,105us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Purchases (24,437)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (32,388)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Sales 27,905us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 15,125us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Maturities, calls and principal repayments 11,721us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 38,672us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Net increase in loans (83,498)us-gaap_PaymentsForProceedsFromLoansAndLeases (51,203)us-gaap_PaymentsForProceedsFromLoansAndLeases
Net Cash Used in Investing Activities (71,174)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (27,284)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash dividends paid, net of reinvestments (420)us-gaap_DividendsCommonStock  
Net proceeds from issuance of common stock   6,896us-gaap_ProceedsFromIssuanceOfCommonStock
Net Cash Provided by Financing Activities 56,053us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 19,757us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (Decrease) Increase in Cash and Cash Equivalents (7,387)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 1,578us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Parent Company [Member]    
Net income 2,600us-gaap_NetIncomeLoss
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1,428us-gaap_NetIncomeLoss
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Net change in other assets and liabilities (718)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
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= us-gaap_ParentCompanyMember
402us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
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Equity in undistributed net income of banking subsidiaries (2,912)sbbx_CashEffectOfEquityInUndistributedEarningsOfBankingSubsidiary
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(1,742)sbbx_CashEffectOfEquityInUndistributedEarningsOfBankingSubsidiary
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Net Cash Provided by Operating Activities (1,030)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
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88us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
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Sales 320us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
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58us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
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Capital contribution to subsidiaries   (6,890)sbbx_PaymentsForContributionsToSubsidiaries
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Net Cash Used in Investing Activities 320us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
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= us-gaap_ParentCompanyMember
(6,832)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
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= us-gaap_ParentCompanyMember
Cash dividends paid, net of reinvestments (420)us-gaap_DividendsCommonStock
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= us-gaap_ParentCompanyMember
 
Net proceeds from issuance of common stock   6,896us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net Cash Provided by Financing Activities (420)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6,896us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
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= us-gaap_ParentCompanyMember
Net (Decrease) Increase in Cash and Cash Equivalents (1,130)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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= us-gaap_ParentCompanyMember
152us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
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Cash and Cash Equivalents - Beginning of Year 1,131us-gaap_CashAndCashEquivalentsAtCarryingValue
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979us-gaap_CashAndCashEquivalentsAtCarryingValue
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Cash and Cash Equivalents - End of Year $ 1us-gaap_CashAndCashEquivalentsAtCarryingValue
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$ 1,131us-gaap_CashAndCashEquivalentsAtCarryingValue
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