Regulatory Matters - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Regulated Asset Liability [Line Items]
Threshold limit of deadband and sharing bands for future surcharge or rebate to customer	$ 4,000,000.0
Company share of benefit (expense) under washington energy recovery mechanism	(10,900,000)	$ (7,700,000)
Threshold to return washington energy recovery mechanism dollars to customers	$ 30,000,000
Proposed cumulative rebate refund period	1 year
Deferred natural gas costs, asset	$ 52,100,000	21,000,000.0
WASHINGTON
Regulated Asset Liability [Line Items]
Decoupling maximum rate increase request	3.00%
WASHINGTON | Power Deferrals Regulatory Asset [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	$ 30,500,000
IDAHO | Power Deferrals Regulatory Asset [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	16,300,000	10,800,000
Power Deferrals Regulatory Liability [Member] | WASHINGTON
Regulated Asset Liability [Line Items]
Regulatory liabilities		11,900,000
Revenue Subject to Refund [Member] | WASHINGTON
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Revenue Subject to Refund [Member] | IDAHO
Regulated Asset Liability [Line Items]
Regulatory liabilities	686,000	686,000
Revenue Subject to Refund [Member] | OREGON
Regulated Asset Liability [Line Items]
Regulatory liabilities	$ 0	$ 0