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Taxes on Income (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Taxes on income      
Unrecognized Tax Benefits $ 0 $ 0 $ 0
Deferred tax assets:      
Regulatory-liability-related 32,220,000 32,640,000  
Contributions and advances 6,850,000 6,390,000  
Deferred Tax Assets, Other 5,324,000 6,092,000  
Deferred tax assets 44,394,000 45,122,000  
Deferred tax liabilities:      
Fixed assets (150,290,000) (146,688,000)  
Regulatory-asset-related: depreciation and other (25,914,000) (22,205,000)  
Balancing and memorandum accounts (non-flow-through) (8,480,000) (7,401,000)  
Deferred tax liabilities (184,684,000) (176,294,000)  
Accumulated deferred income taxes - net (140,290,000) (131,172,000)  
Current      
Federal 19,592,000 19,240,000 12,507,000
State 7,270,000 6,714,000 5,540,000
Total current tax expense 26,862,000 25,954,000 18,047,000
Deferred      
Federal 2,802,000 1,814,000 6,407,000
State 759,000 429,000 216,000
Total deferred tax (benefit) expense 3,561,000 2,243,000 6,623,000
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) 26,202,000 24,071,000 22,872,000
Increase (decrease) in taxes resulting from: 6,425,000 5,764,000 4,758,000
Excess deferred tax amortization (1,356,000) (1,550,000) (1,579,000)
Flow-through on fixed assets 1,069,000 1,056,000 1,244,000
Flow-through on removal costs (1,962,000) (1,031,000) (1,582,000)
Investment tax credit (71,000) (71,000) (71,000)
Other- net 116,000 (42,000) (972,000)
Total income tax expense operations 30,423,000 28,197,000 24,670,000
Income before income tax expense $ 124,770,000 $ 114,622,000 $ 109,012,000
Effective income tax rate (as a percent) 24.40% 24.60% 22.60%
GSWC      
Deferred tax assets:      
Regulatory-liability-related $ 30,410,000 $ 30,782,000  
Contributions and advances 7,227,000 6,771,000  
Deferred Tax Assets, Other 5,689,000 6,663,000  
Deferred tax assets 43,326,000 44,216,000  
Deferred tax liabilities:      
Fixed assets (144,719,000) (141,422,000)  
Regulatory-asset-related: depreciation and other (24,858,000) (21,060,000)  
Balancing and memorandum accounts (non-flow-through) (6,063,000) (6,315,000)  
Deferred tax liabilities (175,640,000) (168,797,000)  
Accumulated deferred income taxes - net (132,314,000) (124,581,000)  
Current      
Federal 13,698,000 14,674,000 $ 9,616,000
State 6,089,000 5,849,000 5,480,000
Total current tax expense 19,787,000 20,523,000 15,096,000
Deferred      
Federal 2,251,000 949,000 4,924,000
State 57,000 232,000 157,000
Total deferred tax (benefit) expense 2,308,000 1,181,000 5,081,000
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) 19,175,000 18,202,000 18,236,000
Increase (decrease) in taxes resulting from: 4,923,000 4,920,000 4,656,000
Excess deferred tax amortization (1,184,000) (1,477,000) (1,579,000)
Flow-through on fixed assets 1,008,000 1,042,000 1,244,000
Flow-through on removal costs (1,954,000) (1,026,000) (1,582,000)
Investment tax credit (71,000) (71,000) (71,000)
Other- net 198,000 114,000 (727,000)
Total income tax expense operations 22,095,000 21,704,000 20,177,000
Income before income tax expense 91,310,000 86,675,000 86,840,000
Pretax income from operations $ 91,310,000 $ 86,675,000 $ 86,840,000
Effective income tax rate (as a percent) 24.20% 25.00% 23.20%