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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 2025 and 2024 is as follows:
| Accumulated Other Comprehensive Income (Loss)
| PNM |  |  |  | Corporate and Other |  | TXNM
| Unrealized Gains on Available-for-Sale Debt Securities |  | Pension Liability Adjustment |  |  |  |  |  | Fair Value Adjustment for Cash Flow Hedges |  |
|  |  | Total |  |  |  |  | Total
| (In thousands)
Balance at December 31, 2024 | $ | 214 |  |  | $ | (75,922) |  |  | $ | (75,708) |  |  |  |  | $ | — |  |  | $ | (75,708) |
Amounts reclassified from AOCI (pre-tax) | (137) |  |  | 1,374 |  |  | 1,237 |  |  |  |  | — |  |  | 1,237 |
Income tax impact of amounts reclassified | 35 |  |  | (349) |  |  | (314) |  |  |  |  | — |  |  | (314) |
Other OCI changes (pre-tax) | 267 |  |  | — |  |  | 267 |  |  |  |  | — |  |  | 267 |
Income tax impact of other OCI changes | (68) |  |  | — |  |  | (68) |  |  |  |  | — |  |  | (68) |
Net after-tax change | 97 |  |  | 1,025 |  |  | 1,122 |  |  |  |  | — |  |  | 1,122 |
Balance at March 31, 2025 | $ | 311 |  |  | $ | (74,897) |  |  | $ | (74,586) |  |  |  |  | $ | — |  |  | $ | (74,586) |
Balance at December 31, 2023 | $ | 10,652 |  |  | $ | (77,157) |  |  | $ | (66,505) |  |  |  |  | $ | 3,665 |  |  | $ | (62,840) |
Amounts reclassified from AOCI (pre-tax) | (10,910) |  |  | 1,216 |  |  | (9,694) |  |  |  |  | 2,745 |  |  | (6,949) |
Income tax impact of amounts reclassified | 2,771 |  |  | (309) |  |  | 2,462 |  |  |  |  | (697) |  |  | 1,765 |
Other OCI changes (pre-tax) | 491 |  |  | — |  |  | 491 |  |  |  |  | 67 |  |  | 558 |
Income tax impact of other OCI changes | (125) |  |  | — |  |  | (125) |  |  |  |  | (17) |  |  | (142) |
Net after-tax change | (7,773) |  |  | 907 |  |  | (6,866) |  |  |  |  | 2,098 |  |  | (4,768) |
Balance at March 31, 2024 | $ | 2,879 |  |  | $ | (76,250) |  |  | $ | (73,371) |  |  |  |  | $ | 5,763 |  |  | $ | (67,608) |

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