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Fair Value of Derivative and Other Financial Instruments, Available for Sale Securities (Details) (PNMR and PNM [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized gains |  |  | $ 43,613 |  | $ 42,602
Available-for-sale securities, Fair value | 236,427 |  | 236,427 |  | 226,855
Proceeds from sales | 30,316 | 61,821 | 53,119 | 76,106 |
Gross realized gains | 5,364 | 4,905 | 8,482 | 6,243 |
Gross realized (losses) | (665) | (1,688) | (1,210) | (1,496) |
Cash and equivalents [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized gains |  |  | 0 |  | 0
Available-for-sale securities, Fair value | 3,114 |  | 3,114 |  | 3,356
Domestic value [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized gains |  |  | 16,014 |  | 14,523
Available-for-sale securities, Fair value | 42,664 |  | 42,664 |  | 39,460
Domestic growth [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized gains |  |  | 19,931 |  | 25,656
Available-for-sale securities, Fair value | 75,621 |  | 75,621 |  | 76,292
International and other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized gains |  |  | 2,227 |  | 1,040
Available-for-sale securities, Fair value | 17,848 |  | 17,848 |  | 16,633
U.S. Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized gains |  |  | 534 |  | 158
Available-for-sale securities, Fair value | 19,814 |  | 19,814 |  | 21,941
Municipals [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized gains |  |  | 4,282 |  | 1,018
Available-for-sale securities, Fair value | 65,872 |  | 65,872 |  | 58,568
Corporate and other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized gains |  |  | 625 |  | 207
Available-for-sale securities, Fair value | 11,494 |  | 11,494 |  | 10,605
Fair Value, Measurements, Recurring [Member] | Nuclear Decommissioning Trust [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 231,900 |  | 231,900 |  | 222,500
Fair Value, Measurements, Recurring [Member] | Mine Reclamation Trust [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | $ 4,500 |  | $ 4,500 |  | $ 4,400

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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