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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 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	$ 2,000	$ 0	$ 17,000
Proceeds from sales	241,992	332,896	440,720	745,645
Gross realized gains	18,320	5,051	33,862	26,279
Gross realized (losses)	$ (4,882)	$ (2,613)	$ (6,491)	$ (15,185)

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