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Pension and Other Postretirement Benefits - Schedule of Expenses for Other Retirement Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
401(k) plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | $ 17,514 | $ 16,118 | $ 15,844
401(k) plan | PNM |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | 11,896 | 10,839 | 11,067
401(k) plan | TNMP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
401(k) plan | 5,617 | 5,279 | 4,776
Non-qualified plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | 4,350 | 1,197 | (1,027)
Non-qualified plan | PNM |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | 2,937 | 825 | (721)
Non-qualified plan | TNMP |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |  |  |
Non-qualified plan | $ 1,414 | $ 372 | $ (305)

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