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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 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) |  |  | 2,297 | $ (5,765) |
Income tax impact of amounts reclassified |  |  | (584) | 2,237 |
Other OCI changes (pre-tax) |  |  | 5,303 | 22,024 |
Income tax impact of other OCI changes |  |  | (1,348) | (8,546) |
Total Other Comprehensive Income | $ 2,277 | $ 3,094 | 5,668 | 9,950 |
Ending balance | 1,836,522 |  | 1,836,522 |  |
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) |  |  | 102 | 484 |
Income tax impact of amounts reclassified |  |  | (27) | (187) |
Other OCI changes (pre-tax) |  |  | 2,431 | (278) |
Income tax impact of other OCI changes |  |  | (618) | 108 |
Total Other Comprehensive Income |  |  | 1,888 | 127 |
Ending balance | 3,041 | 104 | 3,041 | 104 |
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 |  |  | 5,668 |  |
Ending balance | (101,480) | (82,501) | (101,480) | (82,501) |
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) |  |  | 2,195 | (6,249) |
Income tax impact of amounts reclassified |  |  | (557) | 2,424 |
Other OCI changes (pre-tax) |  |  | 2,872 | 22,302 |
Income tax impact of other OCI changes |  |  | (730) | (8,654) |
Total Other Comprehensive Income | 2,188 | 2,989 | 3,780 | 9,823 |
Ending balance | 1,602,800 |  | 1,602,800 |  |
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) |  |  | (3,483) | (11,088) |
Income tax impact of amounts reclassified |  |  | 885 | 4,302 |
Other OCI changes (pre-tax) |  |  | 2,872 | 22,302 |
Income tax impact of other OCI changes |  |  | (730) | (8,654) |
Total Other Comprehensive Income |  |  | (456) | 6,862 |
Ending balance | 1,505 | 11,182 | 1,505 | 11,182 |
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) |  |  | 5,678 | 4,839 |
Income tax impact of amounts reclassified |  |  | (1,442) | (1,878) |
Total Other Comprehensive Income |  |  | 4,236 | 2,961 |
Ending balance | (106,026) | (93,787) | (106,026) | (93,787) |
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 |  |  | 3,780 |  |
Ending balance | $ (104,521) | $ (82,605) | $ (104,521) | $ (82,605) |

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