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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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| Held to maturity debt securities, fair value | $ 29,974,000us-gaap_HeldToMaturitySecuritiesFairValue | $ 31,315,000us-gaap_HeldToMaturitySecuritiesFairValue |
| Common stock, par value | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare |
| Common stock, shares authorized | 50,000,000us-gaap_CommonStockSharesAuthorized | 50,000,000us-gaap_CommonStockSharesAuthorized |
| Common stock, shares issued | 24,801,518us-gaap_CommonStockSharesIssued | 22,050,036us-gaap_CommonStockSharesIssued |
| Common stock, shares outstanding | 24,801,518us-gaap_CommonStockSharesOutstanding | 22,050,036us-gaap_CommonStockSharesOutstanding |
| Series A Preferred Stock [Member] | ||
| Preferred stock, par value |
$ 0.001us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
$ 0.001us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
| Preferred Stock, Liquidation Preference, Value |
$ 1,000,000us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
$ 1,000,000us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
| Preferred stock, authorized |
40,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
40,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
| Preferred stock, shares issued |
40,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
40,000us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
| Preferred stock, shares outstanding |
40,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
40,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |
| Undesignated Preferred Stock [Member] | ||
| Preferred stock, par value |
$ 0.001us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = sfbs_UndesignatedPreferredStockMember |
$ 0.001us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = sfbs_UndesignatedPreferredStockMember |
| Preferred stock, authorized |
1,000,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = sfbs_UndesignatedPreferredStockMember |
1,000,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = sfbs_UndesignatedPreferredStockMember |
| Preferred stock, undesignated |
960,000sfbs_PreferredStockSharesUndesignated / us-gaap_StatementClassOfStockAxis = sfbs_UndesignatedPreferredStockMember |
960,000sfbs_PreferredStockSharesUndesignated / us-gaap_StatementClassOfStockAxis = sfbs_UndesignatedPreferredStockMember |
| X | ||||||||||
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- Definition
Preferred Stock, Shares Undesignated No definition available.
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| X | ||||||||||
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- Definition
Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair value of investments in debt securities classified as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Value of the difference between preference in liquidation and the par or stated values of the preferred shares. No definition available.
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| X | ||||||||||
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- Definition
Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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