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Equity Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | A summary of compensation costs charged to income and proceeds from share based compensation, that are recorded to additional paid-in capital and common stock, by award type, are presented below for the years ended December 31:
| 2021 |  | 2020 |  | 2019
Compensation costs charged to income: |  |  |  |  |
ESPP | $ | 357 |  |  | 323 |  |  | 283 |
Restricted stock and deferred restricted stock | 3,889 |  |  | 3,230 |  |  | 3,123 |
Total compensation costs charged to income | $ | 4,246 |  |  | 3,553 |  |  | 3,406 |
ESPP proceeds | $ | 2,026 |  |  | 1,830 |  |  | 1,603 |
Schedule of Restricted and Deferred Restricted Stock Awards | A summary of SJW Group’s restricted and deferred restricted stock awards under the Plan as of December 31, 2021, and changes during the year ended December 31, 2021, are presented below:
| Units |  | Weighted- Average Grant- Date Fair Value
Outstanding as of January 1, 2021 | 178,106 |  |  | $ | 53.43 |
Granted | 78,235 |  |  | $ | 65.17 |
Issued | (65,591) |  |  | $ | 51.52 |
Forfeited | (22,029) |  |  | $ | 62.54 |
Outstanding as of December 31, 2021 | 168,721 |  |  | $ | 58.43 |
Shares vested as of December 31, 2021 | 45,311 |  |  | $ | 36.65 |
Schedule of Nonvested Restricted Stock Units Activity | A summary of the status of SJW Group’s nonvested restricted and deferred restricted stock awards under the Plan as of December 31, 2021, and changes during the year ended December 31, 2021, are presented below:
| Units |  | Weighted- Average Grant- Date Fair Value
Nonvested as of January 1, 2021 | 109,789 |  |  | $ | 65.18 |
Granted | 78,235 |  |  | $ | 65.17 |
Vested | (51,802) |  |  | $ | 62.15 |
Forfeited | (12,812) |  |  | $ | 65.34 |
Nonvested as of December 31, 2021 | 123,410 |  |  | $ | 66.43 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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