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Fair Value Measures and Disclosures - Gross Realized (Losses) (Details) - PNM - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales	$ 183,566	$ 105,634	$ 274,777	$ 230,880
Gross realized gains	7,014	7,545	10,442	17,723
Gross realized (losses)	$ (5,741)	$ (10,361)	$ (12,212)	$ (16,201)

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