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Fair Value of Derivative and Other Financial Instruments, Debt Maturities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
PNM Resources [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity debt securities, Due within 1 year	$ 2,342
Held-to-maturity debt securities, After 1 year through 5 years	100,387
Held-to-maturity debt securities, After 5 years through 10 years	2,088
Held-to-maturity debt securities, Over 10 years	0
Held-to-maturity debt securities	104,817
Public Service Company of New Mexico [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity debt securities, Due within 1 year	2,342
Held-to-maturity debt securities, After 1 year through 5 years	93,340
Held-to-maturity debt securities, After 5 years through 10 years	0
Held-to-maturity debt securities, Over 10 years	0
Held-to-maturity debt securities	95,682
PNMR and PNM [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale debt securities, Within 1 year	2,057
Available-for-sale debt securities, After 1 year through 5 years	21,281
Available-for-sale debt securities, After 5 years through 10 years	12,185
Available-for-sale debt securities, Over 10 years	41,222
Available-for-sale debt securities	$ 76,745

X

- Definition

This item represents the fair value of debt securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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