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Taxes on Income (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Taxes on income      
Unrecognized Tax Benefits $ 0 $ 0 $ 0
Deferred tax assets:      
Regulatory-liability-related 32,640,000 33,080,000  
Contributions and advances 6,390,000 5,777,000  
Deferred Tax Assets, Other 6,092,000 5,792,000  
Deferred tax assets 45,122,000 44,649,000  
Deferred tax liabilities:      
Fixed assets (146,688,000) (144,444,000)  
Regulatory-asset-related: depreciation and other (22,205,000) (20,641,000)  
Balancing and memorandum accounts (non-flow-through) (7,401,000) (4,868,000)  
Deferred tax liabilities (176,294,000) (169,953,000)  
Accumulated deferred income taxes - net (131,172,000) (125,304,000)  
Current      
Federal 19,240,000 12,507,000 17,252,000
State 6,714,000 5,540,000 6,538,000
Total current tax expense 25,954,000 18,047,000 23,790,000
Deferred      
Federal 1,814,000 6,407,000 (4,334,000)
State 429,000 216,000 (1,439,000)
Total deferred tax (benefit) expense 2,243,000 6,623,000 (5,773,000)
Reconciliations of the effective tax rates to the federal statutory rate      
Federal taxes on pretax income at statutory rate (21% in 2018; 35% in 2017 and 2016) 24,071,000 22,872,000 17,196,000
Increase (decrease) in taxes resulting from: 5,764,000 4,758,000 3,693,000
Excess deferred tax amortization (1,550,000) (1,579,000) (2,101,000)
Flow-through on fixed assets 1,056,000 1,244,000 429,000
Flow-through on removal costs (1,031,000) (1,582,000) (1,445,000)
Investment tax credit (71,000) (71,000) (69,000)
Other- net (42,000) (972,000) 314,000
Total income tax expense operations 28,197,000 24,670,000 18,017,000
Income before income tax expense $ 114,622,000 $ 109,012,000 $ 81,888,000
Effective income tax rate (as a percent) 24.60% 22.60% 22.00%
GSWC      
Deferred tax assets:      
Regulatory-liability-related $ 30,782,000 $ 33,080,000  
Contributions and advances 6,771,000 6,158,000  
Deferred Tax Assets, Other 6,663,000 6,618,000  
Deferred tax assets 44,216,000 45,856,000  
Deferred tax liabilities:      
Fixed assets (141,422,000) (147,759,000)  
Regulatory-asset-related: depreciation and other (21,060,000) (20,641,000)  
Balancing and memorandum accounts (non-flow-through) (6,315,000) (5,262,000)  
Deferred tax liabilities (168,797,000) (173,662,000)  
Accumulated deferred income taxes - net (124,581,000) (127,806,000)  
Current      
Federal 14,674,000 9,616,000 $ 14,488,000
State 5,849,000 5,480,000 5,932,000
Total current tax expense 20,523,000 15,096,000 20,420,000
Deferred      
Federal 949,000 4,924,000 (5,531,000)
State 232,000 157,000 (1,286,000)
Total deferred tax (benefit) expense 1,181,000 5,081,000 (6,817,000)
Reconciliations of the effective tax rates to the federal statutory rate      
Federal taxes on pretax income at statutory rate (21% in 2018; 35% in 2017 and 2016) 18,202,000 18,236,000 12,939,000
Increase (decrease) in taxes resulting from: 4,920,000 4,656,000 3,335,000
Excess deferred tax amortization (1,477,000) (1,579,000) (2,101,000)
Flow-through on fixed assets 1,042,000 1,244,000 429,000
Flow-through on removal costs (1,026,000) (1,582,000) (1,445,000)
Investment tax credit (71,000) (71,000) (69,000)
Other- net 114,000 (727,000) 515,000
Total income tax expense operations 21,704,000 20,177,000 13,603,000
Income before income tax expense 86,675,000 86,840,000 61,615,000
Pretax income from operations $ 86,675,000 $ 86,840,000 $ 61,615,000
Effective income tax rate (as a percent) 25.00% 23.20% 22.10%