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Fair Value of Derivative and Other Financial Instruments, Debt Maturities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
PNMR and PNM [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale debt securities, Within 1 year	$ 1,470
Available-for-sale debt securities, After 1 year through 5 years	20,862
Available-for-sale debt securities, After 5 years through 10 years	11,897
Available-for-sale debt securities, Over 10 years	41,772
Available-for-sale debt securities	76,001
PNM Resources [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity debt securities, Due within 1 year	2,339
Held-to-maturity debt securities, After 1 year through 5 years	115,788
Held-to-maturity debt securities, After 5 years through 10 years	2,060
Held-to-maturity debt securities, Over 10 years	0
Held-to-maturity debt securities	120,187
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	2,339
Held-to-maturity debt securities, After 1 year through 5 years	108,742
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	$ 111,081

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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