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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the nine months ended September 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) | (7,156) |  |  | 6,225 |  |  | (931) |  |  |  |  | (1,117) |  |  | (2,048) |
Income tax impact of amounts reclassified | 1,818 |  |  | (1,581) |  |  | 237 |  |  |  |  | 284 |  |  | 521 |
Other OCI changes (pre-tax) | 14,750 |  |  | — |  |  | 14,750 |  |  |  |  | 33 |  |  | 14,783 |
Income tax impact of other OCI changes | (3,746) |  |  | — |  |  | (3,746) |  |  |  |  | (9) |  |  | (3,755) |
Net after-tax change | 5,666 |  |  | 4,644 |  |  | 10,310 |  |  |  |  | (809) |  |  | 9,501 |
Balance at September 30, 2020 | $ | 16,304 |  |  | $ | (105,049) |  |  | $ | (88,745) |  |  |  |  | $ | (1,131) |  |  | $ | (89,876) |
Balance at December 31, 2018 | $ | 1,939 |  |  | $ | (112,361) |  |  | $ | (110,422) |  |  |  |  | $ | 1,738 |  |  | $ | (108,684) |
Amounts reclassified from AOCI (pre-tax) | (12,563) |  |  | 5,553 |  |  | (7,010) |  |  |  |  | 707 |  |  | (6,303) |
Income tax impact of amounts reclassified | 3,191 |  |  | (1,410) |  |  | 1,781 |  |  |  |  | (179) |  |  | 1,602 |
Other OCI changes (pre-tax) | 23,106 |  |  | — |  |  | 23,106 |  |  |  |  | (3,664) |  |  | 19,442 |
Income tax impact of other OCI changes | (5,869) |  |  | — |  |  | (5,869) |  |  |  |  | 931 |  |  | (4,938) |
Net after-tax change | 7,865 |  |  | 4,143 |  |  | 12,008 |  |  |  |  | (2,205) |  |  | 9,803 |
Balance at September 30, 2019 | $ | 9,804 |  |  | $ | (108,218) |  |  | $ | (98,414) |  |  |  |  | $ | (467) |  |  | $ | (98,881) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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