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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | 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)
| Unrealized Gain on Available-for-Sale Securities |  | Pension Liability Adjustment |  | Fair Value Adjustment for Cash Flow Hedges |  | Total
|  |  | (In thousands) |  |
PNMR |  |  |  |  |  |  |
Balance at December 31, 2010 | $ | 16,211 |  |  | $ | (83,254 | ) |  | $ | (1,623 | ) |  | $ | (68,666 | )
Amounts reclassified from AOCI (pre-tax) | (35,251 | ) |  | 4,292 |  |  | 3,448 |  |  | (27,511 | )
Income tax impact of amounts reclassified | 13,956 |  |  | (1,699 | ) |  | (1,230 | ) |  | 11,027 |
Other OCI changes (pre-tax) | 34,295 |  |  | (2,958 | ) |  | (1,002 | ) |  | 30,335 |
Income tax impact of other OCI changes | (13,577 | ) |  | 1,187 |  |  | 349 |  |  | (12,041 | )
Net change after income taxes | (577 | ) |  | 822 |  |  | 1,565 |  |  | 1,810 |
Balance at December 31, 2011 | 15,634 |  |  | (82,432 | ) |  | (58 | ) |  | (66,856 | )
Amounts reclassified from AOCI (pre-tax) | (37,269 | ) |  | 4,611 |  |  | 182 |  |  | (32,476 | )
Income tax impact of amounts reclassified | 14,755 |  |  | (1,825 | ) |  | (65 | ) |  | 12,865 |
Other OCI changes (pre-tax) | 38,548 |  |  | (30,084 | ) |  | (428 | ) |  | 8,036 |
Income tax impact of other OCI changes | (15,262 | ) |  | 11,910 |  |  | 153 |  |  | (3,199 | )
Net change after income taxes | 772 |  |  | (15,388 | ) |  | (158 | ) |  | (14,774 | )
Balance at December 31, 2012 | 16,406 |  |  | (97,820 | ) |  | (216 | ) |  | (81,630 | )
Amounts reclassified from AOCI (pre-tax) | (11,956 | ) |  | 6,364 |  |  | 207 |  |  | (5,385 | )
Income tax impact of amounts reclassified | 4,734 |  |  | (2,524 | ) |  | (73 | ) |  | 2,137 |
Other OCI changes (pre-tax) | 27,419 |  |  | 17,136 |  |  | (279 | ) |  | 44,276 |
Income tax impact of other OCI changes | (10,855 | ) |  | (6,781 | ) |  | 98 |  |  | (17,538 | )
Net change after income taxes | 9,342 |  |  | 14,195 |  |  | (47 | ) |  | 23,490 |
Balance at December 31, 2013 | $ | 25,748 |  |  | $ | (83,625 | ) |  | $ | (263 | ) |  | $ | (58,140 | )
| Accumulated Other Comprehensive Income (Loss)
| Unrealized Gain on Available-for-Sale Securities |  | Pension Liability Adjustment |  | Fair Value Adjustment for Cash Flow Hedges |  | Total
|  |  | (In thousands) |  |
PNM |  |  |  |  |  |  |
Balance at December 31, 2010 | $ | 16,211 |  |  | $ | (82,981 | ) |  | $ | (16 | ) |  | $ | (66,786 | )
Amounts reclassified from AOCI (pre-tax) | (35,251 | ) |  | 4,278 |  |  | 27 |  |  | (30,946 | )
Income tax impact of amounts reclassified | 13,956 |  |  | (1,694 | ) |  | (11 | ) |  | 12,251 |
Other OCI changes (pre-tax) | 34,295 |  |  | (3,369 | ) |  | — |  |  | 30,926 |
Income tax impact of other OCI changes | (13,577 | ) |  | 1,334 |  |  | — |  |  | (12,243 | )
Net change after income taxes | (577 | ) |  | 549 |  |  | 16 |  |  | (12 | )
Balance at December 31, 2011 | 15,634 |  |  | (82,432 | ) |  | — |  |  | (66,798 | )
Amounts reclassified from AOCI (pre-tax) | (37,269 | ) |  | 4,611 |  |  | — |  |  | (32,658 | )
Income tax impact of amounts reclassified | 14,755 |  |  | (1,825 | ) |  | — |  |  | 12,930 |
Other OCI changes (pre-tax) | 38,548 |  |  | (30,084 | ) |  | — |  |  | 8,464 |
Income tax impact of other OCI changes | (15,262 | ) |  | 11,910 |  |  | — |  |  | (3,352 | )
Net change after income taxes | 772 |  |  | (15,388 | ) |  | — |  |  | (14,616 | )
Balance at December 31, 2012 | 16,406 |  |  | (97,820 | ) |  | — |  |  | (81,414 | )
Amounts reclassified from AOCI (pre-tax) | (11,956 | ) |  | 6,364 |  |  | — |  |  | (5,592 | )
Income tax impact of amounts reclassified | 4,734 |  |  | (2,524 | ) |  | — |  |  | 2,210 |
Other OCI changes (pre-tax) | 27,419 |  |  | 17,136 |  |  | — |  |  | 44,555 |
Income tax impact of other OCI changes | (10,855 | ) |  | (6,781 | ) |  | — |  |  | (17,636 | )
Net change after income taxes | 9,342 |  |  | 14,195 |  |  | — |  |  | 23,537 |
Balance at December 31, 2013 | $ | 25,748 |  |  | $ | (83,625 | ) |  | $ | — |  |  | $ | (57,877 | )
| Accumulated Other Comprehensive Income (Loss)
| Unrealized Gain on Available-for-Sale Securities |  | Pension Liability Adjustment |  | Fair Value Adjustment for Cash Flow Hedges |  | Total
|  |  | (In thousands) |  |
TNMP |  |  |  |  |  |  |
Balance at December 31, 2010 | $ | — |  |  | $ | (275 | ) |  | $ | (1,210 | ) |  | $ | (1,485 | )
Amounts reclassified from AOCI (pre-tax) | — |  |  | 13 |  |  | 2,997 |  |  | 3,010 |
Income tax impact of amounts reclassified | — |  |  | (5 | ) |  | (1,068 | ) |  | (1,073 | )
Other OCI changes (pre-tax) | — |  |  | 414 |  |  | (1,207 | ) |  | (793 | )
Income tax impact of other OCI changes | — |  |  | (147 | ) |  | 430 |  |  | 283 |
Net change after income taxes | — |  |  | 275 |  |  | 1,152 |  |  | 1,427 |
Balance at December 31, 2011 | — |  |  | — |  |  | (58 | ) |  | (58 | )
Amounts reclassified from AOCI (pre-tax) | — |  |  | — |  |  | 182 |  |  | 182 |
Income tax impact of amounts reclassified | — |  |  | — |  |  | (65 | ) |  | (65 | )
Other OCI changes (pre-tax) | — |  |  | — |  |  | (428 | ) |  | (428 | )
Income tax impact of other OCI changes | — |  |  | — |  |  | 153 |  |  | 153 |
Net change after income taxes | — |  |  | — |  |  | (158 | ) |  | (158 | )
Balance at December 31, 2012 | — |  |  | — |  |  | (216 | ) |  | (216 | )
Amounts reclassified from AOCI (pre-tax) | — |  |  | — |  |  | 207 |  |  | 207 |
Income tax impact of amounts reclassified | — |  |  | — |  |  | (73 | ) |  | (73 | )
Other OCI changes (pre-tax) | — |  |  | — |  |  | (279 | ) |  | (279 | )
Income tax impact of other OCI changes | — |  |  | — |  |  | 98 |  |  | 98 |
Net change after income taxes | — |  |  | — |  |  | (47 | ) |  | (47 | )
Balance at December 31, 2013 | $ | — |  |  | $ | — |  |  | $ | (263 | ) |  | $ | (263 | )

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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=28358780&loc=SL7669686-108580 + Details
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