Allowance For Loan Losses And Credit Quality Of Financing Receivables (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Allowance For Loan Losses And Credit Quality Of Financing Receivables [Abstract]
Net allocation of the allowance for credit losses	$ 5	$ 262

Financing Receivable Allocation Of Allowance For Credit Losses From Troubled Debt Restructuring

No definition available.

Name:	sbbx_FinancingReceivableAllocationOfAllowanceForCreditLossesFromTroubledDebtRestructuring
Namespace Prefix:	sbbx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration