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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the six months ended June 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) | (2,580) |  |  | 2,388 |  |  | (192) |  |  |  |  | 1,197 |  |  | 1,005 |
Income tax impact of amounts reclassified | 655 |  |  | (606) |  |  | 49 |  |  |  |  | (304) |  |  | (255) |
Other OCI changes (pre-tax) | 4,560 |  |  | — |  |  | 4,560 |  |  |  |  | 3,567 |  |  | 8,127 |
Income tax impact of other OCI changes | (1,158) |  |  | — |  |  | (1,158) |  |  |  |  | (906) |  |  | (2,064) |
Net after-tax change | 1,477 |  |  | 1,782 |  |  | 3,259 |  |  |  |  | 3,554 |  |  | 6,813 |
Balance at June 30, 2023 | $ | 8,899 |  |  | $ | (79,975) |  |  | $ | (71,076) |  |  |  |  | $ | 11,841 |  |  | $ | (59,235) |
Balance at December 31, 2021 | $ | 11,715 |  |  | $ | (83,651) |  |  | $ | (71,936) |  |  |  |  | $ | — |  |  | $ | (71,936) |
Amounts reclassified from AOCI (pre-tax) | (2,917) |  |  | 3,552 |  |  | 635 |  |  |  |  | (1,185) |  |  | (550) |
Income tax impact of amounts reclassified | 741 |  |  | (902) |  |  | (161) |  |  |  |  | 301 |  |  | 140 |
Other OCI changes (pre-tax) | (9,452) |  |  | — |  |  | (9,452) |  |  |  |  | 3,448 |  |  | (6,004) |
Income tax impact of other OCI changes | 2,401 |  |  | — |  |  | 2,401 |  |  |  |  | (876) |  |  | 1,525 |
Net after-tax change | (9,227) |  |  | 2,650 |  |  | (6,577) |  |  |  |  | 1,688 |  |  | (4,889) |
Balance at June 30, 2022 | $ | 2,488 |  |  | $ | (81,001) |  |  | $ | (78,513) |  |  |  |  | $ | 1,688 |  |  | $ | (76,825) |

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