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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2022
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 2022 and 2021 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, 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) |
Balance at December 31, 2020 | $ | 20,403 |  |  | $ | (98,914) |  |  | $ | (78,511) |  |  |  |  | $ | (672) |  |  | $ | (79,183) |
Amounts reclassified from AOCI (pre-tax) | (3,618) |  |  | 2,087 |  |  | (1,531) |  |  |  |  | (624) |  |  | (2,155) |
Income tax impact of amounts reclassified | 919 |  |  | (530) |  |  | 389 |  |  |  |  | 158 |  |  | 547 |
Other OCI changes (pre-tax) | (3,326) |  |  | — |  |  | (3,326) |  |  |  |  | 1,247 |  |  | (2,079) |
Income tax impact of other OCI changes | 845 |  |  | — |  |  | 845 |  |  |  |  | (317) |  |  | 528 |
Net after-tax change | (5,180) |  |  | 1,557 |  |  | (3,623) |  |  |  |  | 464 |  |  | (3,159) |
Balance at March 31, 2021 | $ | 15,223 |  |  | $ | (97,357) |  |  | $ | (82,134) |  |  |  |  | $ | (208) |  |  | $ | (82,342) |

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