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Stock-Based Compensation Plans 2 (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Options
Common Shares issued as a result of the exercise of stock options	1,800	30,998	32,142
Additional disclosure
Cash proceeds from the exercise of stock options	$ 30	$ 519	$ 546
Unrecognized compensation cost	$ 122
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 10 months 28 days
Restricted Stock Units
Additional disclosure
Unrecognized compensation cost related to performance awards	$ 587
Number of Restricted/Performance Share Units
Restricted share units at the beginning of the period (in shares)	75,071
Granted (in shares)	19,307
Vested (in shares)	(23,713)
Forfeited (in shares)	(1,326)
Restricted share units at the end of the period (in shares)	69,339	75,071
Weighted Average Grant-Date Value
Restricted share units at the beginning of the period (in dollars per share)	$ 46.92
Granted (in dollars per share)	86.41
Vested (in dollars per share)	58.56
Forfeited (in dollars per share)	78.24
Restricted share units at the end of the period (in dollars per share)	$ 53.33	$ 46.92
Stock options
Additional disclosure
Tax benefit for the tax deduction from awards exercised	$ (1,200)	$ (1,800)	(1,600)
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)	84,649
Granted (in shares)	16,375
Performance criteria adjustment (in shares)	(670)
Vested (in shares)	(41,434)
Forfeited (in shares)	(960)
Restricted share units at the end of the period (in shares)	57,960	84,649
Weighted Average Grant-Date Value
Restricted share units at the beginning of the period (in dollars per share)	$ 51.85
Granted (in dollars per share)	89.15
Performance criteria adjustment (in dollars per share)	38.14
Vested (in dollars per share)	44.80
Forfeited (in dollars per share)	82.47
Restricted share units at the end of the period (in dollars per share)	$ 66.40	$ 51.85
GSWC | Stock options
Additional disclosure
Tax benefit for the tax deduction from awards exercised	$ (1,200)	$ (1,800)	$ (1,600)

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