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Fair Value of Derivative and Other Financial Instruments, Avaialbe for Sale Securities (Details) (PNMR and PNM [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Fair value | $ 168,851 | $ 156,922 |
Available-for-sale securities, Unrealized gains | 25,881 | 26,835 |
Proceeds from sales | 145,286 | 79,853 | 124,519
Gross realized gains | 17,493 | 5,635 | 6,009
Gross realized (losses) | (6,223) | (3,704) | (7,359)
Domestic value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Fair value | 25,143 | 25,491 |
Available-for-sale securities, Unrealized gains | 3,549 | 5,108 |
Domestic growth [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Fair value | 52,187 | 48,237 |
Available-for-sale securities, Unrealized gains | 16,714 | 17,239 |
Multinational [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Fair value | 12,754 | 10,670 |
Available-for-sale securities, Unrealized gains | 662 | 2,730 |
Municipals [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Fair value | 41,463 | 37,595 |
Available-for-sale securities, Unrealized gains | 2,861 | 837 |
U.S. Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Fair value | 25,367 | 21,541 |
Available-for-sale securities, Unrealized gains | 1,353 | 348 |
Corporate and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Fair value | 9,171 | 8,402 |
Available-for-sale securities, Unrealized gains | 742 | 573 |
Cash and equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, Fair value | 2,766 | 4,986 |
Available-for-sale securities, Unrealized gains | $ 0 | $ 0 |

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