PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Income) (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2014
|
Sep. 30, 2014
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Jun. 30, 2014
|
Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
|
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Income: | |||||||||||
Other income | $ 1,006us-gaap_OtherIncome | $ 878us-gaap_OtherIncome | $ 744us-gaap_OtherIncome | ||||||||
Expense: | |||||||||||
Net income | 52,377us-gaap_NetIncomeLoss | 41,617us-gaap_NetIncomeLoss | 34,445us-gaap_NetIncomeLoss | ||||||||
Dividends on preferred stock | 431us-gaap_PreferredStockDividendsIncomeStatementImpact | 416us-gaap_PreferredStockDividendsIncomeStatementImpact | 400us-gaap_PreferredStockDividendsIncomeStatementImpact | ||||||||
Net income available to common stockholders | 14,917us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 13,902us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 11,469us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 11,658us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 11,752us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 10,712us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 9,586us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 9,151us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 51,946us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 41,201us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 34,045us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Parent Company [Member] | |||||||||||
Income: | |||||||||||
Dividends received from subsidiary |
12,000us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
4,750us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
0us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
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Other income |
0us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
1us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
41us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
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Total income |
12,000us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
4,751us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
41us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
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Expense: | |||||||||||
Other expenses |
1,183us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
1,147us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
1,594us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
||||||||
Total expenses |
1,183us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
1,147us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
1,594us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
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Equity in undistributed earnings of subsidiary |
41,529sfbs_EquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
37,997sfbs_EquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
35,998sfbs_EquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
||||||||
Net income |
52,346us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
41,601us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
34,445us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
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Dividends on preferred stock |
400us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
400us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
400us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
||||||||
Net income available to common stockholders |
$ 51,946us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
$ 41,201us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
$ 34,045us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
X | ||||||||||
- Definition
Equity In Undistributed Earnings Of Subsidiary. No definition available.
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X | ||||||||||
- Details
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X | ||||||||||
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X | ||||||||||
- Definition
Amount of operating dividend income on securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. No definition available.
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X | ||||||||||
- Definition
The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders. No definition available.
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X | ||||||||||
- Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Details
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