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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 1,761,448 |  |
Balance, as adjusted |  |  |  |  | $ 1,761,448
Amounts reclassified from AOCI (pre-tax) |  |  | 655 | $ (3,412) |
Income tax impact of amounts reclassified |  |  | (167) | 1,324 |
Other OCI changes (pre-tax) |  |  | 3,892 | 14,615 |
Income tax impact of other OCI changes |  |  | (989) | (5,671) |
Total Other Comprehensive Income | $ 1,763 | $ 2,863 | 3,391 | 6,856 |
Ending balance | 1,788,315 | (85,595) | 1,788,315 | (85,595) |
Fair Value Adjustment for Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 1,153 | (23) |
Cumulative effect adjustment (Note 7) |  |  |  |  | 0
Balance, as adjusted |  |  |  |  | 1,153
Amounts reclassified from AOCI (pre-tax) |  |  | (7) | 323 |
Income tax impact of amounts reclassified |  |  | 1 | (125) |
Other OCI changes (pre-tax) |  |  | 2,420 | (288) |
Income tax impact of other OCI changes |  |  | (615) | 112 |
Total Other Comprehensive Income |  |  | 1,799 | 22 |
Ending balance | 2,952 | (1) | 2,952 | (1) |
AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  | (95,940) | (92,451) |
Cumulative effect adjustment (Note 7) |  |  |  |  | (11,208)
Balance, as adjusted |  |  |  |  | (107,148)
Total Other Comprehensive Income |  |  | 3,391 |  |
Ending balance | (103,757) |  | (103,757) |  |
PNM |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 1,488,369 |  |
Balance, as adjusted |  |  |  |  | 1,488,369
Amounts reclassified from AOCI (pre-tax) |  |  | 662 | (3,735) |
Income tax impact of amounts reclassified |  |  | (168) | 1,449 |
Other OCI changes (pre-tax) |  |  | 1,472 | 14,903 |
Income tax impact of other OCI changes |  |  | (374) | (5,783) |
Total Other Comprehensive Income | 1,310 | 2,796 | 1,592 | 6,834 |
Ending balance | 1,523,612 |  | 1,523,612 |  |
PNM | Unrealized Gains on Available-for-Sale Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 13,169 | 4,320 |
Cumulative effect adjustment (Note 7) |  |  |  |  | (11,208)
Balance, as adjusted |  |  |  |  | 1,961
Amounts reclassified from AOCI (pre-tax) |  |  | (3,126) | (6,961) |
Income tax impact of amounts reclassified |  |  | 794 | 2,701 |
Other OCI changes (pre-tax) |  |  | 1,472 | 14,903 |
Income tax impact of other OCI changes |  |  | (374) | (5,783) |
Total Other Comprehensive Income |  |  | (1,234) | 4,860 |
Ending balance | 727 | 9,180 | 727 | 9,180 |
PNM | Pension Liability Adjustment |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  | (110,262) | (96,748) |
Cumulative effect adjustment (Note 7) |  |  |  |  | 0
Balance, as adjusted |  |  |  |  | (110,262)
Amounts reclassified from AOCI (pre-tax) |  |  | 3,788 | 3,226 |
Income tax impact of amounts reclassified |  |  | (962) | (1,252) |
Total Other Comprehensive Income |  |  | 2,826 | 1,974 |
Ending balance | (107,436) | (94,774) | (107,436) | (94,774) |
PNM | AOCI |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Beginning balance |  |  | (97,093) | (92,428) |
Cumulative effect adjustment (Note 7) |  |  |  |  | (11,208)
Balance, as adjusted |  |  |  |  | $ (108,301)
Total Other Comprehensive Income |  |  | 1,592 |  |
Ending balance | $ (106,709) | $ (85,594) | $ (106,709) | $ (85,594) |

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