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Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
401(k) plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | $ 16,118 | $ 15,844 | $ 16,648
401(k) plan | PNM |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | 10,839 | 11,067 | 11,826
401(k) plan | TNMP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | 5,279 | 4,776 | 4,823
Non-qualified plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | 1,197 | (1,027) | 3,594
Non-qualified plan | PNM |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | 825 | (721) | 2,622
Non-qualified plan | TNMP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | $ 372 | $ (305) | $ 972

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