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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 2019 and 2018 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, 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 | )
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 | )

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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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