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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Rollforward of AOCI | Information regarding AOCI is as follows:
| Accumulated Other Comprehensive Income (Loss)
| PNM |  |  |  | TXNM
| Unrealized Gains on Available-for-Sale Securities |  | Pension Liability Adjustment |  | Total |  |  |  | Fair Value Adjustment for Cash Flow Hedges |  | Total
| (In thousands)
Balance at December 31, 2021 | $ | 11,715 |  |  | $ | (83,651) |  |  | $ | (71,936) |  |  |  |  | $ | — |  |  | $ | (71,936) |
Amounts reclassified from AOCI (pre-tax) | (3,827) |  |  | 7,104 |  |  | 3,277 |  |  |  |  | (1,176) |  |  | 2,101 |
Income tax impact of amounts reclassified | 972 |  |  | (1,804) |  |  | (832) |  |  |  |  | 299 |  |  | (533) |
Other OCI changes (pre-tax) | (1,928) |  |  | (4,565) |  |  | (6,493) |  |  |  |  | 12,285 |  |  | 5,792 |
Income tax impact of other OCI changes | 490 |  |  | 1,159 |  |  | 1,649 |  |  |  |  | (3,121) |  |  | (1,472) |
Net after-tax change | (4,293) |  |  | 1,894 |  |  | (2,399) |  |  |  |  | 8,287 |  |  | 5,888 |
Balance at December 31, 2022 | 7,422 |  |  | (81,757) |  |  | (74,335) |  |  |  |  | 8,287 |  |  | (66,048) |
Amounts reclassified from AOCI (pre-tax) | (7,199) |  |  | 4,776 |  |  | (2,423) |  |  |  |  | 9,287 |  |  | 6,864 |
Income tax impact of amounts reclassified | 1,828 |  |  | (1,212) |  |  | 616 |  |  |  |  | (2,359) |  |  | (1,743) |
Other OCI changes (pre-tax) | 11,529 |  |  | 1,389 |  |  | 12,918 |  |  |  |  | (15,483) |  |  | (2,565) |
Income tax impact of other OCI changes | (2,928) |  |  | (353) |  |  | (3,281) |  |  |  |  | 3,933 |  |  | 652 |
Net after-tax change | 3,230 |  |  | 4,600 |  |  | 7,830 |  |  |  |  | (4,622) |  |  | 3,208 |
Balance at December 31, 2023 | 10,652 |  |  | (77,157) |  |  | (66,505) |  |  |  |  | 3,665 |  |  | (62,840) |
Amounts reclassified from AOCI (pre-tax) | (13,108) |  |  | 4,866 |  |  | (8,242) |  |  |  |  | 10,348 |  |  | 2,106 |
Income tax impact of amounts reclassified | 3,330 |  |  | (1,236) |  |  | 2,094 |  |  |  |  | (2,629) |  |  | (535) |
Other OCI changes (pre-tax) | (885) |  |  | (3,210) |  |  | (4,095) |  |  |  |  | (15,260) |  |  | (19,355) |
Income tax impact of other OCI changes | 225 |  |  | 815 |  |  | 1,040 |  |  |  |  | 3,876 |  |  | 4,916 |
Net after-tax change | (10,438) |  |  | 1,235 |  |  | (9,203) |  |  |  |  | (3,665) |  |  | (12,868) |
Balance at December 31, 2024 | $ | 214 |  |  | $ | (75,922) |  |  | $ | (75,708) |  |  |  |  | $ | — |  |  | $ | (75,708) |

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