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Fair Value Measures and Disclosures - Gross Realized (Losses) (Details) - PNM - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from sales | $ 137,797 | $ 92,371 | $ 412,574 | $ 323,251
Gross realized gains | 4,022 | 2,366 | 14,464 | 20,089
Gross realized (losses) | $ (6,876) | $ (6,908) | $ (19,088) | $ (23,109)

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