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Fair Value of Derivative and Other Financial Instruments - Gross Realized (Losses) (Details) - PNM - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-sale [Line Items]
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings	$ 1,600	$ 1,400	$ 15,000	$ 3,400
Proceeds from sales	110,240	183,566	412,750	274,777
Gross realized gains	7,549	7,014	21,228	10,442
Gross realized (losses)	$ (4,661)	$ (5,741)	$ (12,573)	$ (12,212)

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(Increase)/Decrease In Other Than Temporary Losses, Investments, Portion Recognized In Earnings, Net, Available-For-Sale Securities

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