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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the six months ended June 30, 2020 and 2019 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, 2019 | $ | 10,638 |  |  | $ | (109,693) |  |  | $ | (99,055) |  |  |  |  | $ | (322) |  |  | $ | (99,377) |
Amounts reclassified from AOCI (pre-tax) | (3,059) |  |  | 4,150 |  |  | 1,091 |  |  |  |  | (500) |  |  | 591 |
Income tax impact of amounts reclassified | 777 |  |  | (1,054) |  |  | (277) |  |  |  |  | 127 |  |  | (150) |
Other OCI changes (pre-tax) | 9,717 |  |  | — |  |  | 9,717 |  |  |  |  | (1,198) |  |  | 8,519 |
Income tax impact of other OCI changes | (2,468) |  |  | — |  |  | (2,468) |  |  |  |  | 304 |  |  | (2,164) |
Net after-tax change | 4,967 |  |  | 3,096 |  |  | 8,063 |  |  |  |  | (1,267) |  |  | 6,796 |
Balance at June 30, 2020 | $ | 15,605 |  |  | $ | (106,597) |  |  | $ | (90,992) |  |  |  |  | $ | (1,589) |  |  | $ | (92,581) |
Balance at December 31, 2018 | $ | 1,939 |  |  | $ | (112,361) |  |  | $ | (110,422) |  |  |  |  | $ | 1,738 |  |  | $ | (108,684) |
Amounts reclassified from AOCI (pre-tax) | (5,601) |  |  | 3,702 |  |  | (1,899) |  |  |  |  | 525 |  |  | (1,374) |
Income tax impact of amounts reclassified | 1,423 |  |  | (940) |  |  | 483 |  |  |  |  | (133) |  |  | 350 |
Other OCI changes (pre-tax) | 15,938 |  |  | — |  |  | 15,938 |  |  |  |  | (3,169) |  |  | 12,769 |
Income tax impact of other OCI changes | (4,048) |  |  | — |  |  | (4,048) |  |  |  |  | 805 |  |  | (3,243) |
Net after-tax change | 7,712 |  |  | 2,762 |  |  | 10,474 |  |  |  |  | (1,972) |  |  | 8,502 |
Balance at June 30, 2019 | $ | 9,651 |  |  | $ | (109,599) |  |  | $ | (99,948) |  |  |  |  | $ | (234) |  |  | $ | (100,182) |

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