Derivatives - Schedule Of Derivative Financial Instruments Designated As Cash Flow Hedges (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI on Derivatives, net of Tax (Effective Portion)	$ 114	$ (815)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0
Derivative Effective Date March 15, 2016 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI on Derivatives, net of Tax (Effective Portion)	66	(166)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0
Derivative Effective Date December 15, 2016 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI on Derivatives, net of Tax (Effective Portion)	16	(134)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0
Derivative Effective Date June 15, 2017 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI on Derivatives, net of Tax (Effective Portion)	14	(168)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0
Derivative Effective Date December 15, 2017 Contract 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI on Derivatives, net of Tax (Effective Portion)	12	(224)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	0	0
Derivative Effective Date December 15, 2017 Contract 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI on Derivatives, net of Tax (Effective Portion)	6	(123)
Amount of Gain (Loss) Recognized in Income of Derivatives (Ineffective Portion)	$ 0	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sbbx_DerivativeEffectiveDateMarch152016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sbbx_DerivativeEffectiveDateDecember152016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sbbx_DerivativeEffectiveDateJune152017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sbbx_DerivativeEffectiveDateDecember152017Contract1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sbbx_DerivativeEffectiveDateDecember152017Contract2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: