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Stock-Based Compensation Plans 2 (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Number of Options      
Common Shares issued as a result of the exercise of stock options 0 0 1,800
Additional disclosure      
Cash proceeds from the exercise of stock options     $ 30
Vesting period 3 years    
Unrecognized compensation cost $ 235    
Weighted Average Grant-Date Value      
Capitalized equity-based compensation cost $ 290 $ 336 299
Maximum      
Additional disclosure      
Percentage of target amount of performance shares 200.00%    
Minimum      
Additional disclosure      
Percentage of target amount of performance shares 0.00%    
Weighted Average      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 1 year 11 months 1 day    
Restricted Stock Units      
Additional disclosure      
Unrecognized compensation cost related to performance awards $ 611    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 51,110    
Granted (in shares) 19,135    
Vested (in shares) (22,165)    
Forfeited (in shares) (528)    
Restricted share units at the end of the period (in shares) 47,552 51,110  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 47.83    
Granted (in dollars per share) 88.10    
Vested (in dollars per share) 79.11    
Forfeited (in dollars per share) 87.42    
Restricted share units at the end of the period (in dollars per share) $ 49.01 $ 47.83  
Stock options      
Additional disclosure      
Tax benefit for the tax deduction from awards exercised $ (900) $ (1,400) (1,200)
Performance awards      
Additional disclosure      
Vesting period 3 years    
Period to meet the performance goals 3 years    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 48,910    
Granted (in shares) 17,448    
Performance criteria adjustment (in shares) 1,883    
Vested (in shares) (18,806)    
Restricted share units at the end of the period (in shares) 49,435 48,910  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 75.23    
Granted (in dollars per share) 88.58    
Performance criteria adjustment (in dollars per share) 79.25    
Vested (in dollars per share) 65.78    
Restricted share units at the end of the period (in dollars per share) $ 83.70 $ 75.23  
Performance awards | 2000 and 2008 Employee Plans      
Additional disclosure      
Vesting period 3 years    
GSWC      
Weighted Average Grant-Date Value      
Capitalized equity-based compensation cost $ 290 $ 336 299
GSWC | Stock options      
Additional disclosure      
Tax benefit for the tax deduction from awards exercised $ (900) $ (1,400) $ (1,200)
American States Utility Services | Maximum      
Additional disclosure      
Percentage of target amount of performance shares 250.00%