DEBT SECURITIES (Amortized Cost And Fair Value Of Contractual Securities) (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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Available-for-sale | ||
Amortized Cost | $ 291,403us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 259,734us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Fair Value | 298,310us-gaap_AvailableForSaleSecurities | 265,728us-gaap_AvailableForSaleSecurities |
Held-to-maturity | ||
Amortized Cost | 29,355us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment | 32,274us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment |
Fair Value | 29,974us-gaap_HeldToMaturitySecuritiesFairValue | 31,315us-gaap_HeldToMaturitySecuritiesFairValue |
Less than one year [Member] | ||
Available-for-sale | ||
Amortized Cost |
16,944us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = sfbs_DueWithinOneYearMember |
5,659us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = sfbs_DueWithinOneYearMember |
Fair Value |
17,246us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = sfbs_DueWithinOneYearMember |
5,717us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = sfbs_DueWithinOneYearMember |
One year to five years [Member] | ||
Available-for-sale | ||
Amortized Cost |
121,591us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = sfbs_DueFromOneToFiveYearsMember |
102,535us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = sfbs_DueFromOneToFiveYearsMember |
Fair Value |
123,962us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = sfbs_DueFromOneToFiveYearsMember |
104,887us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = sfbs_DueFromOneToFiveYearsMember |
Five years to ten years [Member] | ||
Available-for-sale | ||
Amortized Cost |
60,079us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = sfbs_FiveYearsToTenYearsMember |
65,174us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = sfbs_FiveYearsToTenYearsMember |
Fair Value |
61,221us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = sfbs_FiveYearsToTenYearsMember |
66,229us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = sfbs_FiveYearsToTenYearsMember |
Held-to-maturity | ||
Amortized Cost |
298us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_StatementScenarioAxis = sfbs_FiveYearsToTenYearsMember |
0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_StatementScenarioAxis = sfbs_FiveYearsToTenYearsMember |
Fair Value |
325us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_StatementScenarioAxis = sfbs_FiveYearsToTenYearsMember |
0us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_StatementScenarioAxis = sfbs_FiveYearsToTenYearsMember |
More than Ten years [Member] | ||
Available-for-sale | ||
Amortized Cost |
350us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = sfbs_MoreThanTenYearsMember |
1,094us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = sfbs_MoreThanTenYearsMember |
Fair Value |
358us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = sfbs_MoreThanTenYearsMember |
1,147us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = sfbs_MoreThanTenYearsMember |
Held-to-maturity | ||
Amortized Cost |
5,253us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_StatementScenarioAxis = sfbs_MoreThanTenYearsMember |
5,544us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_StatementScenarioAxis = sfbs_MoreThanTenYearsMember |
Fair Value |
5,716us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_StatementScenarioAxis = sfbs_MoreThanTenYearsMember |
5,741us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_StatementScenarioAxis = sfbs_MoreThanTenYearsMember |
Mortgage-backed securities [Member] | ||
Available-for-sale | ||
Amortized Cost |
92,439us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = us-gaap_MortgageBackedSecuritiesMember |
85,272us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_StatementScenarioAxis = us-gaap_MortgageBackedSecuritiesMember |
Fair Value |
95,523us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = us-gaap_MortgageBackedSecuritiesMember |
87,748us-gaap_AvailableForSaleSecurities / us-gaap_StatementScenarioAxis = us-gaap_MortgageBackedSecuritiesMember |
Held-to-maturity | ||
Amortized Cost |
23,804us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_StatementScenarioAxis = us-gaap_MortgageBackedSecuritiesMember |
26,730us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_StatementScenarioAxis = us-gaap_MortgageBackedSecuritiesMember |
Fair Value |
$ 23,933us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_StatementScenarioAxis = us-gaap_MortgageBackedSecuritiesMember |
$ 25,574us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_StatementScenarioAxis = us-gaap_MortgageBackedSecuritiesMember |
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- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. No definition available.
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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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