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Fair Value of Derivative and Other Financial Instruments - Investment in NDT and Gross Realized Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity securities: |  |  |
Net gains (losses) from equity securities sold | $ 1,086 | $ (6,940) | $ 8,738
Net gains (losses) from equity securities still held | 14,152 | (38,025) | (442)
Total net gains (losses) on equity securities | 15,238 | (44,965) | 8,296
Available-for-sale debt securities: |  |  |
Net gains (losses) on debt securities | 4,008 | (33,392) | 8,554
Net gains (losses) on investment securities | 19,246 | (78,357) | 16,850
PNM |  |  |
Available-for-sale debt securities: |  |  |
Net gains (losses) on debt securities | (19,100) | 25,800 | (700)
Proceeds from sales | 574,199 | 526,448 | 459,867
Gross realized gains | 18,618 | 22,071 | 39,408
Gross realized (losses) | $ (32,649) | $ (36,623) | $ (22,815)

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