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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding AOCI is as follows:
| Accumulated Other Comprehensive Income (Loss)
| PNM |  |  |  | PNMR
| Unrealized Gains on Available-for-Sale Securities |  | Pension Liability Adjustment |  | Total |  |  |  | Fair Value Adjustment for Cash Flow Hedges |  | Total
| (In thousands)
Balance at December 31, 2017, as originally reported | $ | 13,169 |  |  | $ | (110,262) |  |  | $ | (97,093) |  |  |  |  | $ | 1,153 |  |  | $ | (95,940) |
Cumulative effect adjustment (Note 9) | (11,208) |  |  | — |  |  | (11,208) |  |  |  |  | — |  |  | (11,208) |
Balance at January 1, 2018, as adjusted | 1,961 |  |  | (110,262) |  |  | (108,301) |  |  |  |  | 1,153 |  |  | (107,148) |
Amounts reclassified from AOCI (pre-tax) | (3,819) |  |  | 7,568 |  |  | 3,749 |  |  |  |  | 216 |  |  | 3,965 |
Income tax impact of amounts reclassified | 970 |  |  | (1,922) |  |  | (952) |  |  |  |  | (56) |  |  | (1,008) |
Other OCI changes (pre-tax) | 3,790 |  |  | (10,382) |  |  | (6,592) |  |  |  |  | 570 |  |  | (6,022) |
Income tax impact of other OCI changes | (963) |  |  | 2,637 |  |  | 1,674 |  |  |  |  | (145) |  |  | 1,529 |
Net after-tax change | (22) |  |  | (2,099) |  |  | (2,121) |  |  |  |  | 585 |  |  | (1,536) |
Balance at December 31, 2018 | 1,939 |  |  | (112,361) |  |  | (110,422) |  |  |  |  | 1,738 |  |  | (108,684) |
Amounts reclassified from AOCI (pre-tax) | (14,063) |  |  | 7,404 |  |  | (6,659) |  |  |  |  | 733 |  |  | (5,926) |
Income tax impact of amounts reclassified | 3,572 |  |  | (1,880) |  |  | 1,692 |  |  |  |  | (186) |  |  | 1,506 |
Other OCI changes (pre-tax) | 25,724 |  |  | (3,829) |  |  | 21,895 |  |  |  |  | (3,495) |  |  | 18,400 |
Income tax impact of other OCI changes | (6,534) |  |  | 973 |  |  | (5,561) |  |  |  |  | 888 |  |  | (4,673) |
Net after-tax change | 8,699 |  |  | 2,668 |  |  | 11,367 |  |  |  |  | (2,060) |  |  | 9,307 |
Balance at December 31, 2019 | 10,638 |  |  | (109,693) |  |  | (99,055) |  |  |  |  | (322) |  |  | (99,377) |
Amounts reclassified from AOCI (pre-tax) | (9,497) |  |  | 8,300 |  |  | (1,197) |  |  |  |  | (1,740) |  |  | (2,937) |
Income tax impact of amounts reclassified | 2,412 |  |  | (2,108) |  |  | 304 |  |  |  |  | 442 |  |  | 746 |
Other OCI changes (pre-tax) | 22,586 |  |  | 6,149 |  |  | 28,735 |  |  |  |  | 1,271 |  |  | 30,006 |
Income tax impact of other OCI changes | (5,736) |  |  | (1,562) |  |  | (7,298) |  |  |  |  | (323) |  |  | (7,621) |
Net after-tax change | 9,765 |  |  | 10,779 |  |  | 20,544 |  |  |  |  | (350) |  |  | 20,194 |
Balance at December 31, 2020 | $ | 20,403 |  |  | $ | (98,914) |  |  | $ | (78,511) |  |  |  |  | $ | (672) |  |  | $ | (79,183) |

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