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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2024
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2024 and 2023 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, 2023 | $ | 10,652 |  |  | $ | (77,157) |  |  | $ | (66,505) |  |  |  |  | $ | 3,665 |  |  | $ | (62,840) |
Amounts reclassified from AOCI (pre-tax) | (12,932) |  |  | 3,649 |  |  | (9,283) |  |  |  |  | 8,456 |  |  | (827) |
Income tax impact of amounts reclassified | 3,285 |  |  | (927) |  |  | 2,358 |  |  |  |  | (2,148) |  |  | 210 |
Other OCI changes (pre-tax) | 362 |  |  | — |  |  | 362 |  |  |  |  | (13,689) |  |  | (13,327) |
Income tax impact of other OCI changes | (92) |  |  | — |  |  | (92) |  |  |  |  | 3,477 |  |  | 3,385 |
Net after-tax change | (9,377) |  |  | 2,722 |  |  | (6,655) |  |  |  |  | (3,904) |  |  | (10,559) |
Balance at September 30, 2024 | $ | 1,275 |  |  | $ | (74,435) |  |  | $ | (73,160) |  |  |  |  | $ | (239) |  |  | $ | (73,399) |
Balance at December 31, 2022 | $ | 7,422 |  |  | $ | (81,757) |  |  | $ | (74,335) |  |  |  |  | $ | 8,287 |  |  | $ | (66,048) |
Amounts reclassified from AOCI (pre-tax) | (4,111) |  |  | 3,582 |  |  | (529) |  |  |  |  | 5,286 |  |  | 4,757 |
Income tax impact of amounts reclassified | 1,044 |  |  | (909) |  |  | 135 |  |  |  |  | (1,343) |  |  | (1,208) |
Other OCI changes (pre-tax) | 2,491 |  |  | — |  |  | 2,491 |  |  |  |  | (2,386) |  |  | 105 |
Income tax impact of other OCI changes | (632) |  |  | — |  |  | (632) |  |  |  |  | 606 |  |  | (26) |
Net after-tax change | (1,208) |  |  | 2,673 |  |  | 1,465 |  |  |  |  | 2,163 |  |  | 3,628 |
Balance at September 30, 2023 | $ | 6,214 |  |  | $ | (79,084) |  |  | $ | (72,870) |  |  |  |  | $ | 10,450 |  |  | $ | (62,420) |

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