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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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	$ 189,426		$ 189,426		$ 168,851
Available-for-sale securities, Unrealized gains	32,504		32,504		25,881
Proceeds from sales	90,518	26,312	136,305	121,202
Gross realized gains	6,263	2,800	11,029	16,290
Gross realized (losses)	(5,131)	(1,847)	(7,055)	(4,129)
Domestic value [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	29,856		29,856		25,143
Available-for-sale securities, Unrealized gains	5,083		5,083		3,549
Domestic growth [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	53,246		53,246		52,187
Available-for-sale securities, Unrealized gains	20,062		20,062		16,714
Multinational [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	12,064		12,064		12,754
Available-for-sale securities, Unrealized gains	434		434		662
Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	44,173		44,173		41,463
Available-for-sale securities, Unrealized gains	4,307		4,307		2,861
U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	33,479		33,479		25,367
Available-for-sale securities, Unrealized gains	1,451		1,451		1,353
Corporate and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	13,788		13,788		9,171
Available-for-sale securities, Unrealized gains	1,167		1,167		742
Cash and equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	2,820		2,820		2,766
Available-for-sale securities, Unrealized gains	$ 0		$ 0		$ 0

X

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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