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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) AOCI reports a measure for accumulated changes in equity that result from transactions and other economic events other than transactions with shareholders. Information regarding AOCI is as follows:
| Accumulated Other Comprehensive Income (Loss)
| PNM |  |  |  | PNMR
| Unrealized Gains on Available-for-Sale Securities |  | Pension Liability Adjustment |  | Total |  |  |  | Fair Value Adjustment for Cash Flow 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 9) | (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) | (3,819) |  |  | 7,568 |  |  | 3,749 |  |  |  |  | 216 |  |  | 3,965 |
Income tax impact of amounts reclassified | 970 |  |  | (1,922) |  |  | (952) |  |  |  |  | (56) |  |  | (1,008) |
Other OCI changes (pre-tax) | 3,790 |  |  | (10,382) |  |  | (6,592) |  |  |  |  | 570 |  |  | (6,022) |
Income tax impact of other OCI changes | (963) |  |  | 2,637 |  |  | 1,674 |  |  |  |  | (145) |  |  | 1,529 |
Net after-tax change | (22) |  |  | (2,099) |  |  | (2,121) |  |  |  |  | 585 |  |  | (1,536) |
Balance at December 31, 2018 | 1,939 |  |  | (112,361) |  |  | (110,422) |  |  |  |  | 1,738 |  |  | (108,684) |
Amounts reclassified from AOCI (pre-tax) | (14,063) |  |  | 7,404 |  |  | (6,659) |  |  |  |  | 733 |  |  | (5,926) |
Income tax impact of amounts reclassified | 3,572 |  |  | (1,880) |  |  | 1,692 |  |  |  |  | (186) |  |  | 1,506 |
Other OCI changes (pre-tax) | 25,724 |  |  | (3,829) |  |  | 21,895 |  |  |  |  | (3,495) |  |  | 18,400 |
Income tax impact of other OCI changes | (6,534) |  |  | 973 |  |  | (5,561) |  |  |  |  | 888 |  |  | (4,673) |
Net after-tax change | 8,699 |  |  | 2,668 |  |  | 11,367 |  |  |  |  | (2,060) |  |  | 9,307 |
Balance at December 31, 2019 | 10,638 |  |  | (109,693) |  |  | (99,055) |  |  |  |  | (322) |  |  | (99,377) |
Amounts reclassified from AOCI (pre-tax) | (9,497) |  |  | 8,300 |  |  | (1,197) |  |  |  |  | (1,740) |  |  | (2,937) |
Income tax impact of amounts reclassified | 2,412 |  |  | (2,108) |  |  | 304 |  |  |  |  | 442 |  |  | 746 |
Other OCI changes (pre-tax) | 22,586 |  |  | 6,149 |  |  | 28,735 |  |  |  |  | 1,271 |  |  | 30,006 |
Income tax impact of other OCI changes | (5,736) |  |  | (1,562) |  |  | (7,298) |  |  |  |  | (323) |  |  | (7,621) |
Net after-tax change | 9,765 |  |  | 10,779 |  |  | 20,544 |  |  |  |  | (350) |  |  | 20,194 |
Balance at December 31, 2020 | $ | 20,403 |  |  | $ | (98,914) |  |  | $ | (78,511) |  |  |  |  | $ | (672) |  |  | $ | (79,183) |
The Consolidated Statements of Earnings include pre-tax amounts reclassified from AOCI related to Unrealized Gains on Available-for-Sale Debt Securities in gains (losses) on investment securities, related to Pension Liability Adjustment in other (deductions), and related to Fair Value Adjustment for Cash Flow Hedges in interest charges. The income tax impacts of all amounts reclassified from AOCI are included in income taxes in the Consolidated Statements of Earnings.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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