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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, 2013	Mar. 31, 2012	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains	$ 33,680		$ 27,156
Available-for-sale securities, Fair value	201,407		192,511
Proceeds from sales	14,284	26,760
Gross realized gains	1,391	2,332
Gross realized (losses)	(407)	(738)
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	3,877		4,628
Domestic value [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains	8,782		5,223
Available-for-sale securities, Fair value	34,410		30,044
Domestic growth [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains	18,184		15,212
Available-for-sale securities, Fair value	55,435		51,650
International and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains	803		247
Available-for-sale securities, Fair value	15,420		14,868
U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains	1,077		1,305
Available-for-sale securities, Fair value	33,721		32,592
Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains	3,845		4,069
Available-for-sale securities, Fair value	43,459		43,861
Corporate and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains	989		1,100
Available-for-sale securities, Fair value	$ 15,085		$ 14,868

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

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