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Stock-Based Compensation Plans 2 (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Options      
Common Shares issued as a result of the exercise of stock options 30,998 32,142 52,936
Additional disclosure      
Cash proceeds from the exercise of stock options $ 519 $ 546 $ 909
Unrecognized compensation cost $ 245    
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 [Member]      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 1 year 25 days    
Restricted Stock Units      
Additional disclosure      
Unrecognized compensation cost related to performance awards $ 390    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 102,235    
Granted (in shares) 23,550    
Vested (in shares) (48,017)    
Forfeited (in shares) (2,697)    
Restricted share units at the end of the period (in shares) 75,071 102,235  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 34.73    
Granted (in dollars per share) 67.57    
Vested (in dollars per share) 30.99    
Forfeited (in dollars per share) 48.64    
Restricted share units at the end of the period (in dollars per share) $ 46.92 $ 34.73  
Stock options      
Additional disclosure      
Tax benefit for the tax deduction from awards exercised $ (1,800) $ (1,600) (1,000)
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) 95,661    
Granted (in shares) 22,035    
Performance criteria adjustment (in shares) 1,772    
Vested (in shares) (33,080)    
Forfeited (in shares) (1,739)    
Restricted share units at the end of the period (in shares) 84,649 95,661  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 45.36    
Granted (in dollars per share) 65.86    
Performance criteria adjustment (in dollars per share) 38.14    
Vested (in dollars per share) 41.15    
Forfeited (in dollars per share) 61.74    
Restricted share units at the end of the period (in dollars per share) $ 51.85 $ 45.36  
GSWC | Stock options      
Additional disclosure      
Tax benefit for the tax deduction from awards exercised $ (1,800) $ (1,600) $ (1,000)