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Stock-Based Compensation Plans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) stock_plan shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Stock compensation plans
Number of stock incentive plans | stock_plan	3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 115
Stock-based compensation recognized in the income statement, before taxes	2,566	$ 2,463	$ 2,517
Capitalized equity-based compensation cost	$ 336	299	265
Immediate vesting for employees of certain age and above	55 years
GSWC
Stock compensation plans
Stock-based compensation recognized in the income statement, before taxes	$ 2,313	2,349	2,253
Capitalized equity-based compensation cost	336	299	265
Nonqualified stock options
Stock compensation plans
Tax benefits from exercise of stock-based awards	1,400	1,200	1,800
Nonqualified stock options | GSWC
Stock compensation plans
Tax benefits from exercise of stock-based awards	1,400	1,200	1,800
Restricted Stock Units | Employees and directors
Stock compensation plans
Stock-based compensation recognized in the income statement, before taxes	2,566	2,463	2,517
Restricted Stock Units | Employees and directors | GSWC
Stock compensation plans
Stock-based compensation recognized in the income statement, before taxes	$ 2,313	$ 2,349	$ 2,253
Performance awards
Stock compensation plans
Vesting period	3 years
2000 and 2008 Employee Plans | Nonqualified stock options
Stock compensation plans
Percentage of rights vesting in the third year from the date of grant	34.00%
2000 and 2008 Employee Plans | Restricted Stock Units
Stock compensation plans
Common stock entitled to be received under each award | shares	1
Percentage of rights vesting in the first two years from the date of grant	33.00%
Percentage of rights vesting in the third year from the date of grant	34.00%
2000 and 2008 Employee Plans | Performance awards
Stock compensation plans
Vesting period	3 years
Percentage of rights vesting in the first two years from the date of grant	33.00%
Percentage of rights vesting in the third year from the date of grant	34.00%
2003 and 2013 Directors plans [Member]
Stock compensation plans
Vesting period	90 days
Maximum
Stock compensation plans
Chang in control, term	24
Weighted Average [Member]
Stock compensation plans
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 6 months
Weighted Average [Member] | Restricted Stock [Member]
Stock compensation plans
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 5 months 26 days

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