Earnings Per Share / Capital Stock- Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Feb. 27, 2024
Additional disclosure
Maximum consideration on transaction				$ 200,000,000
Agreement term	3 years
Number of shares issued in transaction (in shares)	903,769	1,145,219
Payments for commissions	$ 1,000,000.0	$ 1,400,000
Consideration received on transaction	67,300,000	89,500,000
Payments of stock issuance costs	400,000	$ 800,000
Sale of Stock, remaining available for sale	$ 40,700,000
Issuance of Common Shares from an at-the-market program, net of issuance costs (in Shares)	27,674	25,196	18,371
Proceeds from stock options exercised, distributed to subsidiaries	$ 0	$ 0	$ 0
Dividend reinvestment plan common stock capital shares reserved for future issuance (in shares)	1,055,948
Common Shares authorized for issuance but unissued under 401(k) Plan (in shares)	387,300
Preferred stock, shares authorized (in shares)	150,000
Preferred stock, no par value (in USD per share)	$ 0
Preferred stock, shares outstanding (in shares)	0
Issuance of Common Shares from an at-the-market program, net of issuance costs	$ 66,998,000	$ 88,661,000
GSWC
Additional disclosure
Issuance of Common Shares from an at-the-market program, net of issuance costs (in Shares)	4.6250	2.7586	1
Issuance of Common Shares from an at-the-market program, net of issuance costs	$ 61,998,000	$ 40,000,000	$ 10,000,000