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Lines of Credit - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 23, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Line of Credit Facility [Line Items] |  |  |  |
Repayments of Lines of Credit |  | $ 208,722,000 | $ 218,289,000 | $ 192,055,000
Revolving Credit Facility | Line of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 260,000,000 |  |
Revolving Credit Facility | Line of Credit | SJW Group |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit cost of borrowing rate |  | 1.32% | 1.78% |
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | SJWC | SJWC Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Repayments of Lines of Credit | $ 140,000,000 |  |  |
Line of credit facility, maximum borrowing capacity | 140,000,000 |  |  |
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | SJW Group and CLWSC | SJWTX Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Repayments of Lines of Credit | 5,000,000 |  |  |
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | SJW Corp. and SJWTX, Inc. | SJWTX Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 5,000,000 |  |  |
Standby Letters of Credit | Chase Bank, N.A. | Line of Credit | SJWC | SJWC Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 15,000,000 |  |  |
Standby Letters of Credit | Chase Bank, N.A. | Line of Credit | SJW Corp. and SJWTX, Inc. | SJWTX Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000 |  |  |

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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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