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Fair Value Measures and Disclosures - Gross Realized (Losses) (Details) - PNM - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from sales | $ 105,634 | $ 239,696 | $ 230,880 | $ 363,291
Gross realized gains | 7,545 | 10,611 | 17,723 | 19,304
Gross realized (losses) | $ (10,361) | $ (7,805) | $ (16,201) | $ (11,249)

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