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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
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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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