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SUBSEQUENT EVENTS (Additional Information) (Detail) (USD $)
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1 Months Ended | ||
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Jan. 31, 2015
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Dec. 31, 2014
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Dec. 31, 2013
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| Subsequent Event [Line Items] | |||
| Assets | $ 4,098,679,000us-gaap_Assets | $ 3,520,699,000us-gaap_Assets | |
| Loans and Leases Receivable, Net Of Deferred Income | 3,359,858,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | 2,858,868,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | |
| Deposits | 3,398,160,000us-gaap_Deposits | 3,019,642,000us-gaap_Deposits | |
| Stockholders' Equity Attributable to Parent | 406,961,000us-gaap_StockholdersEquity | 297,192,000us-gaap_StockholdersEquity | |
| Metro [Member] | |||
| Subsequent Event [Line Items] | |||
| Assets |
211,000,000us-gaap_Assets / us-gaap_BusinessAcquisitionAxis = sfbs_MetroMember |
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| Loans and Leases Receivable, Net Of Deferred Income |
154,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_BusinessAcquisitionAxis = sfbs_MetroMember |
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| Deposits |
182,000,000us-gaap_Deposits / us-gaap_BusinessAcquisitionAxis = sfbs_MetroMember |
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| Stockholders' Equity Attributable to Parent |
28,000,000us-gaap_StockholdersEquity / us-gaap_BusinessAcquisitionAxis = sfbs_MetroMember |
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| Subsequent Event [Member] | Metro [Member] | |||
| Subsequent Event [Line Items] | |||
| Noncontrolling Interest, Ownership Percentage by Parent |
100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = sfbs_MetroMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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| Stock Issued During Period, Shares, Acquisitions |
636,720us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = sfbs_MetroMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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| Payments to Acquire Businesses, Gross |
20,900,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = sfbs_MetroMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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| Business Combination, Consideration Transferred |
$ 40,300,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = sfbs_MetroMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The parent entity's interest in net assets of the subsidiary, expressed as a percentage. No definition available.
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- Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of shares of stock issued during the period pursuant to acquisitions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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