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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the six months ended June 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) | (3,126 | ) |  | 3,788 |  |  | 662 |  |  | (7 | ) |  | 655 |
Income tax impact of amounts reclassified | 794 |  |  | (962 | ) |  | (168 | ) |  | 1 |  |  | (167 | )
Other OCI changes (pre-tax) | 1,472 |  |  | — |  |  | 1,472 |  |  | 2,420 |  |  | 3,892 |
Income tax impact of other OCI changes | (374 | ) |  | — |  |  | (374 | ) |  | (615 | ) |  | (989 | )
Net after-tax change | (1,234 | ) |  | 2,826 |  |  | 1,592 |  |  | 1,799 |  |  | 3,391 |
Balance at June 30, 2018 | $ | 727 |  |  | $ | (107,436 | ) |  | $ | (106,709 | ) |  | $ | 2,952 |  |  | $ | (103,757 | )
Balance at December 31, 2016 | $ | 4,320 |  |  | $ | (96,748 | ) |  | $ | (92,428 | ) |  | $ | (23 | ) |  | $ | (92,451 | )
Amounts reclassified from AOCI (pre-tax) | (6,961 | ) |  | 3,226 |  |  | (3,735 | ) |  | 323 |  |  | (3,412 | )
Income tax impact of amounts reclassified | 2,701 |  |  | (1,252 | ) |  | 1,449 |  |  | (125 | ) |  | 1,324 |
Other OCI changes (pre-tax) | 14,903 |  |  | — |  |  | 14,903 |  |  | (288 | ) |  | 14,615 |
Income tax impact of other OCI changes | (5,783 | ) |  | — |  |  | (5,783 | ) |  | 112 |  |  | (5,671 | )
Net after-tax change | 4,860 |  |  | 1,974 |  |  | 6,834 |  |  | 22 |  |  | 6,856 |
Balance at June 30, 2017 | $ | 9,180 |  |  | $ | (94,774 | ) |  | $ | (85,594 | ) |  | $ | (1 | ) |  | $ | (85,595 | )

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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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