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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 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) | (702) |  |  | 1,194 |  |  | 492 |  |  |  |  | (2,224) |  |  | (1,732) |
Income tax impact of amounts reclassified | 178 |  |  | (303) |  |  | (125) |  |  |  |  | 565 |  |  | 440 |
Other OCI changes (pre-tax) | 4,170 |  |  | — |  |  | 4,170 |  |  |  |  | (168) |  |  | 4,002 |
Income tax impact of other OCI changes | (1,059) |  |  | — |  |  | (1,059) |  |  |  |  | 43 |  |  | (1,016) |
Net after-tax change | 2,587 |  |  | 891 |  |  | 3,478 |  |  |  |  | (1,784) |  |  | 1,694 |
Balance at March 31, 2023 | $ | 10,009 |  |  | $ | (80,866) |  |  | $ | (70,857) |  |  |  |  | $ | 6,503 |  |  | $ | (64,354) |
| 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, 2021 | $ | 11,715 |  |  | $ | (83,651) |  |  | $ | (71,936) |  |  |  |  | $ | — |  |  | $ | (71,936) |
Amounts reclassified from AOCI (pre-tax) | (1,477) |  |  | 1,776 |  |  | 299 |  |  |  |  | — |  |  | 299 |
Income tax impact of amounts reclassified | 375 |  |  | (451) |  |  | (76) |  |  |  |  | — |  |  | (76) |
Other OCI changes (pre-tax) | (6,524) |  |  | — |  |  | (6,524) |  |  |  |  | — |  |  | (6,524) |
Income tax impact of other OCI changes | 1,657 |  |  | — |  |  | 1,657 |  |  |  |  | — |  |  | 1,657 |
Net after-tax change | (5,969) |  |  | 1,325 |  |  | (4,644) |  |  |  |  | — |  |  | (4,644) |
Balance at March 31, 2022 | $ | 5,746 |  |  | $ | (82,326) |  |  | $ | (76,580) |  |  |  |  | $ | — |  |  | $ | (76,580) |

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