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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2023 and 2022 is as follows:
| Accumulated Other Comprehensive Income (Loss)
| PNM |  |  |  | Corporate and Other |  | PNMR Consolidated
| 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, 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) |
Balance at December 31, 2021 | $ | 11,715 |  |  | $ | (83,651) |  |  | $ | (71,936) |  |  |  |  | $ | — |  |  | $ | (71,936) |
Amounts reclassified from AOCI (pre-tax) | (3,426) |  |  | 5,328 |  |  | 1,902 |  |  |  |  | (1,767) |  |  | 135 |
Income tax impact of amounts reclassified | 870 |  |  | (1,353) |  |  | (483) |  |  |  |  | 449 |  |  | (34) |
Other OCI changes (pre-tax) | (8,170) |  |  | — |  |  | (8,170) |  |  |  |  | 10,391 |  |  | 2,221 |
Income tax impact of other OCI changes | 2,075 |  |  | — |  |  | 2,075 |  |  |  |  | (2,640) |  |  | (565) |
Net after-tax change | (8,651) |  |  | 3,975 |  |  | (4,676) |  |  |  |  | 6,433 |  |  | 1,757 |
Balance at September 30, 2022 | $ | 3,064 |  |  | $ | (79,676) |  |  | $ | (76,612) |  |  |  |  | $ | 6,433 |  |  | $ | (70,179) |

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