XML 94 R78.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Note 13 - Employee and Director Benefits - Exercisable Options Activity (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) $ / shares shares
Shares, exercisable (in shares) | shares | 143,300
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 21.84
Weighted Average Remaining Contractual Term, exercisable (Year) | 2 years 2 months 12 days
Aggregate Intrinsic Value, exercisable | $ | $ 6,419
Exercise Price Range 1 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 6
Range of Exercise Price, Upper Range (in dollars per share) | $ 7
Shares, exercisable (in shares) | shares | 7,500
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 6.92
Weighted Average Remaining Contractual Term, exercisable (Year) | 1 month 6 days
Aggregate Intrinsic Value, exercisable | $ | $ 448
Exercise Price Range 2 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 15
Range of Exercise Price, Upper Range (in dollars per share) | $ 16
Shares, exercisable (in shares) | shares | 42,800
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 15.52
Weighted Average Remaining Contractual Term, exercisable (Year) | 1 year 1 month 6 days
Aggregate Intrinsic Value, exercisable | $ | $ 2,188
Exercise Price Range 3 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 17
Range of Exercise Price, Upper Range (in dollars per share) | $ 18
Shares, exercisable (in shares) | shares | 21,500
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 17.17
Weighted Average Remaining Contractual Term, exercisable (Year) | 1 year 3 months 18 days
Aggregate Intrinsic Value, exercisable | $ | $ 1,063
Exercise Price Range 4 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 18
Range of Exercise Price, Upper Range (in dollars per share) | $ 19
Shares, exercisable (in shares) | shares | 6,000
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 18.49
Weighted Average Remaining Contractual Term, exercisable (Year) | 1 year 8 months 12 days
Aggregate Intrinsic Value, exercisable | $ | $ 289
Exercise Price Range 5 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 19
Range of Exercise Price, Upper Range (in dollars per share) | $ 20
Shares, exercisable (in shares) | shares | 24,000
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 19.16
Weighted Average Remaining Contractual Term, exercisable (Year) | 2 years 1 month 6 days
Aggregate Intrinsic Value, exercisable | $ | $ 1,139
Exercise Price Range 6 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 25
Range of Exercise Price, Upper Range (in dollars per share) | $ 26
Shares, exercisable (in shares) | shares | 4,000
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 25.41
Weighted Average Remaining Contractual Term, exercisable (Year) | 2 years 8 months 12 days
Aggregate Intrinsic Value, exercisable | $ | $ 165
Exercise Price Range 7 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 33
Range of Exercise Price, Upper Range (in dollars per share) | $ 34
Shares, exercisable (in shares) | shares | 2,000
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 33.48
Weighted Average Remaining Contractual Term, exercisable (Year) | 5 years
Aggregate Intrinsic Value, exercisable | $ | $ 66
Exercise Price Range 8 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 35
Range of Exercise Price, Upper Range (in dollars per share) | $ 36
Shares, exercisable (in shares) | shares | 25,000
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 35.65
Weighted Average Remaining Contractual Term, exercisable (Year) | 4 years 9 months 18 days
Aggregate Intrinsic Value, exercisable | $ | $ 775
Exercise Price Range 9 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 38
Range of Exercise Price, Upper Range (in dollars per share) | $ 39
Shares, exercisable (in shares) | shares | 8,000
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 38.29
Weighted Average Remaining Contractual Term, exercisable (Year) | 3 years 1 month 6 days
Aggregate Intrinsic Value, exercisable | $ | $ 227
Exercise Price Range 10 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 41
Range of Exercise Price, Upper Range (in dollars per share) | $ 42
Shares, exercisable (in shares) | shares | 1,000
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 41.21
Weighted Average Remaining Contractual Term, exercisable (Year) | 4 years 1 month 6 days
Aggregate Intrinsic Value, exercisable | $ | $ 25
Exercise Price Range 11 [Member] |
Range of Exercise Price, Lower Range (in dollars per share) | $ 43
Range of Exercise Price, Upper Range (in dollars per share) | $ 44
Shares, exercisable (in shares) | shares | 1,500
Weighted Average Exercise Price, exercisable (in dollars per share) | $ 43.8
Weighted Average Remaining Contractual Term, exercisable (Year) | 4 years 6 months
Aggregate Intrinsic Value, exercisable | $ | $ 34

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange6Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange7Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange8Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange9Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange10Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=sfbs_ExercisePriceRange11Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |