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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, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	$ 192,511	$ 168,851
Available-for-sale securities, Unrealized gains	27,156	25,881
Proceeds from sales	167,330	145,286	79,853
Gross realized gains	15,907	17,493	5,635
Gross realized (losses)	(8,170)	(6,223)	(3,704)
Domestic value [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	30,044	25,143
Available-for-sale securities, Unrealized gains	5,223	3,549
Domestic growth [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	51,650	52,187
Available-for-sale securities, Unrealized gains	15,212	16,714
International and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	14,868	12,754
Available-for-sale securities, Unrealized gains	247	662
Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	43,861	41,463
Available-for-sale securities, Unrealized gains	4,069	2,861
U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	32,592	25,367
Available-for-sale securities, Unrealized gains	1,305	1,353
Corporate and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	14,868	9,171
Available-for-sale securities, Unrealized gains	1,100	742
Cash and equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	4,628	2,766
Available-for-sale securities, Unrealized gains	$ 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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