Capital And Regulatory Matters (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
Aug. 05, 2013	Dec. 31, 2014
Capital And Regulatory Matters [Abstract]
Cash reserve balance required		$ 2,300,000
Dividend payment restrictions, minimum capital stock surplus		50.00%
Funds available for payment of dividends		54,300,000
Restricted equity in net assets		7,500,000
Shares issuable from rights	1,198,300
Shares issuable per right	0.35
Subscription price	$ 6.00
Net proceeds from rights	6,900,000
Gross proceeds from rights	7,200,000us-gaap_ProceedsFromIssuanceOfWarrants
Sale of stock, offering costs	$ 294,000sbbx_SaleOfStockOfferingCosts

Dividend Payment Restrictions Minimum Capital Stock Surplus

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- Definition

Proceeds from issuance of warrants, net of offering costs

+ References

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- Definition

Sale of stock, offering costs

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- Definition

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 305

-Section 50

-Paragraph 1

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(2))

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-Name Regulation S-X (SX)

-Number 210

-Section 08

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-Subparagraph 2

-Article 4

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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- Definition

The amount of retained earnings as of the balance sheet date that cannot be distributed to stockholders pursuant to statutory rules and regulations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)

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Amount of dividends that can be declared or paid with approval of regulatory agency.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(e))

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-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph e

-Article 4

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