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Fair Value of Derivative and Other Financial Instruments - Schedule of Gains and Losses Recognized on the Consolidated Statements of Earnings Related to Investment Securities in the NDT and Reclamation Trusts and Gross Realized Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity securities:
Net gains (losses) from equity securities sold	$ 28,283	$ 1,086	$ (6,940)
Net gains (losses) from equity securities still held	(10,071)	14,152	(38,025)
Total net gains (losses) on equity securities	18,212	15,238	(44,965)
Available-for-sale debt securities:
Net gains (losses) on debt securities	8,639	4,008	(33,392)
Net gains (losses) on investment securities	26,851	19,246	(78,357)
PNM
Available-for-sale debt securities:
Net gains (losses) on debt securities	17,800	(19,100)	25,800
Proceeds from sales	707,338	574,199	526,448
Gross realized gains	35,918	18,618	22,071
Gross realized (losses)	$ (16,814)	$ (32,649)	$ (36,623)

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