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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 2020 and 2019 is as follows:
| Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
| PNM |  |  |  |  |  |  |  | PNMR |  |
| Unrealized |  |  |  |  |  |  |  | Fair Value |  |
| Gains on |  |  |  |  |  |  |  | Adjustment |  |
| Available-for- |  | Pension |  |  |  |  |  | for Cash |  |
| Sale Debt |  | Liability |  |  |  |  |  | Flow |  |
| Securities |  | Adjustment |  | Total |  |  |  | Hedges |  | Total
| (In thousands) |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 | $ | 10,638 |  |  | $ | (109,693) |  |  | $ | (99,055) |  |  |  |  | $ | (322) |  |  | $ | (99,377) |
Amounts reclassified from AOCI (pre-tax) | (1,185) |  |  | 2,075 |  |  | 890 |  |  |  |  | (38) |  |  | 852 |
Income tax impact of amounts reclassified | 301 |  |  | (527) |  |  | (226) |  |  |  |  | 10 |  |  | (216) |
Other OCI changes (pre-tax) | (4,283) |  |  | — |  |  | (4,283) |  |  |  |  | (1,998) |  |  | (6,281) |
Income tax impact of other OCI changes | 1,088 |  |  | — |  |  | 1,088 |  |  |  |  | 507 |  |  | 1,595 |
Net after-tax change | (4,079) |  |  | 1,548 |  |  | (2,531) |  |  |  |  | (1,519) |  |  | (4,050) |
Balance at March 31, 2020 | $ | 6,559 |  |  | $ | (108,145) |  |  | $ | (101,586) |  |  |  |  | $ | (1,841) |  |  | $ | (103,427) |
Balance at December 31, 2018 | $ | 1,939 |  |  | $ | (112,361) |  |  | $ | (110,422) |  |  |  |  | $ | 1,738 |  |  | $ | (108,684) |
Amounts reclassified from AOCI (pre-tax) | (676) |  |  | 1,851 |  |  | 1,175 |  |  |  |  | 270 |  |  | 1,445 |
Income tax impact of amounts reclassified | 172 |  |  | (470) |  |  | (298) |  |  |  |  | (68) |  |  | (366) |
Other OCI changes (pre-tax) | 7,078 |  |  | — |  |  | 7,078 |  |  |  |  | (1,225) |  |  | 5,853 |
Income tax impact of other OCI changes | (1,798) |  |  | — |  |  | (1,798) |  |  |  |  | 311 |  |  | (1,487) |
Net after-tax change | 4,776 |  |  | 1,381 |  |  | 6,157 |  |  |  |  | (712) |  |  | 5,445 |
Balance at March 31, 2019 | $ | 6,715 |  |  | $ | (110,980) |  |  | $ | (104,265) |  |  |  |  | $ | 1,026 |  |  | $ | (103,239) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=118930883&loc=SL7669686-108580 + Details
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