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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2018 and 2017 is as follows:
| Accumulated Other Comprehensive Income (Loss)
| PNM |  | PNMR
| Unrealized |  |  |  |  |  | Fair Value |  |
| Gains on |  |  |  |  |  | Adjustment |  |
| Available-for- |  | Pension |  |  |  | for Cash |  |
| Sale |  | Liability |  |  |  | Flow |  |
| Securities |  | Adjustment |  | Total |  | 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 7) | (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) | (3,483 | ) |  | 5,678 |  |  | 2,195 |  |  | 102 |  |  | 2,297 |
Income tax impact of amounts reclassified | 885 |  |  | (1,442 | ) |  | (557 | ) |  | (27 | ) |  | (584 | )
Other OCI changes (pre-tax) | 2,872 |  |  | — |  |  | 2,872 |  |  | 2,431 |  |  | 5,303 |
Income tax impact of other OCI changes | (730 | ) |  | — |  |  | (730 | ) |  | (618 | ) |  | (1,348 | )
Net after-tax change | (456 | ) |  | 4,236 |  |  | 3,780 |  |  | 1,888 |  |  | 5,668 |
Balance at September 30, 2018 | $ | 1,505 |  |  | $ | (106,026 | ) |  | $ | (104,521 | ) |  | $ | 3,041 |  |  | $ | (101,480 | )
Balance at December 31, 2016 | $ | 4,320 |  |  | $ | (96,748 | ) |  | $ | (92,428 | ) |  | $ | (23 | ) |  | $ | (92,451 | )
Amounts reclassified from AOCI (pre-tax) | (11,088 | ) |  | 4,839 |  |  | (6,249 | ) |  | 484 |  |  | (5,765 | )
Income tax impact of amounts reclassified | 4,302 |  |  | (1,878 | ) |  | 2,424 |  |  | (187 | ) |  | 2,237 |
Other OCI changes (pre-tax) | 22,302 |  |  | — |  |  | 22,302 |  |  | (278 | ) |  | 22,024 |
Income tax impact of other OCI changes | (8,654 | ) |  | — |  |  | (8,654 | ) |  | 108 |  |  | (8,546 | )
Net after-tax change | 6,862 |  |  | 2,961 |  |  | 9,823 |  |  | 127 |  |  | 9,950 |
Balance at September 30, 2017 | $ | 11,182 |  |  | $ | (93,787 | ) |  | $ | (82,605 | ) |  | $ | 104 |  |  | $ | (82,501 | )

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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=114867106&loc=SL7669686-108580 + Details
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