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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	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	$ 183,711		$ 168,851
Available-for-sale securities, Unrealized gains	35,651		25,881
Proceeds from sales	26,760	48,120
Gross realized gains	2,332	4,790
Gross realized (losses)	(738)	(1,728)
Domestic value [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	27,974		25,143
Available-for-sale securities, Unrealized gains	4,712		3,549
Domestic growth [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	63,261		52,187
Available-for-sale securities, Unrealized gains	24,998		16,714
Multinational [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	13,026		12,754
Available-for-sale securities, Unrealized gains	1,014		662
Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	41,723		41,463
Available-for-sale securities, Unrealized gains	3,081		2,861
U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	24,675		25,367
Available-for-sale securities, Unrealized gains	954		1,353
Corporate and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	10,347		9,171
Available-for-sale securities, Unrealized gains	892		742
Cash and equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	2,705		2,766
Available-for-sale securities, Unrealized gains	$ 0		$ 0

X

- Definition

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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