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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Unrealized gains | $ 42,725 |  | $ 42,602
Available-for-sale securities, Fair value | 230,250 |  | 226,855
Proceeds from sales | 22,804 | 14,284 |
Gross realized gains | 3,119 | 1,391 |
Gross realized (losses) | (545) | (407) |
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 | 4,246 |  | 3,356
Domestic value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Unrealized gains | 14,558 |  | 14,523
Available-for-sale securities, Fair value | 41,055 |  | 39,460
Domestic growth [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Unrealized gains | 23,002 |  | 25,656
Available-for-sale securities, Fair value | 74,517 |  | 76,292
International and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Unrealized gains | 1,671 |  | 1,040
Available-for-sale securities, Fair value | 17,264 |  | 16,633
U.S. Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Unrealized gains | 377 |  | 158
Available-for-sale securities, Fair value | 20,662 |  | 21,941
Municipals [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Unrealized gains | 2,659 |  | 1,018
Available-for-sale securities, Fair value | 61,158 |  | 58,568
Corporate and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Unrealized gains | 458 |  | 207
Available-for-sale securities, Fair value | 11,348 |  | 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 | 225,800 |  | 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 | $ 4,400 |  | $ 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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- Definition This item represents the gross loss 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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