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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 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) | (2,629 | ) |  | 1,891 |  |  | (738 | ) |  | (53 | ) |  | (791 | )
Income tax impact of amounts reclassified | 668 |  |  | (480 | ) |  | 188 |  |  | 13 |  |  | 201 |
Other OCI changes (pre-tax) | 1,115 |  |  | — |  |  | 1,115 |  |  | 1,858 |  |  | 2,973 |
Income tax impact of other OCI changes | (283 | ) |  | — |  |  | (283 | ) |  | (472 | ) |  | (755 | )
Net after-tax change | (1,129 | ) |  | 1,411 |  |  | 282 |  |  | 1,346 |  |  | 1,628 |
Balance at March 31, 2018 | $ | 832 |  |  | $ | (108,851 | ) |  | $ | (108,019 | ) |  | $ | 2,499 |  |  | $ | (105,520 | )
Balance at December 31, 2016 | $ | 4,320 |  |  | $ | (96,748 | ) |  | $ | (92,428 | ) |  | $ | (23 | ) |  | $ | (92,451 | )
Amounts reclassified from AOCI (pre-tax) | (2,763 | ) |  | 1,618 |  |  | (1,145 | ) |  | 112 |  |  | (1,033 | )
Income tax impact of amounts reclassified | 1,078 |  |  | (631 | ) |  | 447 |  |  | (44 | ) |  | 403 |
Other OCI changes (pre-tax) | 7,766 |  |  | — |  |  | 7,766 |  |  | (185 | ) |  | 7,581 |
Income tax impact of other OCI changes | (3,030 | ) |  | — |  |  | (3,030 | ) |  | 72 |  |  | (2,958 | )
Net after-tax change | 3,051 |  |  | 987 |  |  | 4,038 |  |  | (45 | ) |  | 3,993 |
Balance at March 31, 2017 | $ | 7,371 |  |  | $ | (95,761 | ) |  | $ | (88,390 | ) |  | $ | (68 | ) |  | $ | (88,458 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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