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Fair Value of Derivative and Other Financial Instruments - Schedule of Gross Realized Gains and Losses (Details) - PNM - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings	$ 0	$ 1,600	$ 0	$ 15,000
Proceeds from sales	108,625	110,240	198,728	412,750
Gross realized gains	7,859	7,549	15,541	21,228
Gross realized (losses)	$ (919)	$ (4,661)	$ (1,609)	$ (12,573)

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