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COMMON STOCK (Additional Information) (Detail) (USD $)
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0 Months Ended | 12 Months Ended | 1 Months Ended |
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Jun. 16, 2014
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Dec. 31, 2013
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May 19, 2014
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| Stock Offering Cost | $ 38,000sfbs_StockOfferingcost | ||
| Proceeds from Issuance of Private Placement | 10,337,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement | ||
| Stockholders' Equity Note, Stock Split | three-for-one split | ||
| IPO [Member] | |||
| Stock Issued During Period, Shares, New Issues |
1,875,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
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| Sale of Stock, Price Per Share |
$ 30.33us-gaap_SaleOfStockPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
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| Proceeds from Issuance of Private Placement |
$ 52,100,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
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| Private Placement [Member] | |||
| Stock Issued During Period, Shares, New Issues |
750,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |
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| Sale of Stock, Price Per Share |
$ 13.83us-gaap_SaleOfStockPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |
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- Definition
The expenses during the period relating to issuance of securities. No definition available.
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- Definition
The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. No definition available.
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- Definition
Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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