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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2017 and 2016 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, 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 | )
Balance at December 31, 2015 | $ | 17,346 |  |  | $ | (88,822 | ) |  | $ | (71,476 | ) |  | $ | 44 |  |  | $ | (71,432 | )
Amounts reclassified from AOCI (pre-tax) | (10,135 | ) |  | 4,128 |  |  | (6,007 | ) |  | 573 |  |  | (5,434 | )
Income tax impact of amounts reclassified | 3,955 |  |  | (1,611 | ) |  | 2,344 |  |  | (224 | ) |  | 2,120 |
Other OCI changes (pre-tax) | 3,115 |  |  | — |  |  | 3,115 |  |  | (1,305 | ) |  | 1,810 |
Income tax impact of other OCI changes | (1,216 | ) |  | — |  |  | (1,216 | ) |  | 509 |  |  | (707 | )
Net after-tax change | (4,281 | ) |  | 2,517 |  |  | (1,764 | ) |  | (447 | ) |  | (2,211 | )
Balance at September 30, 2016 | $ | 13,065 |  |  | $ | (86,305 | ) |  | $ | (73,240 | ) |  | $ | (403 | ) |  | $ | (73,643 | )

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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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