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Fair Value of Derivative and Other Financial Instruments, Debt Maturities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
PNM Resources [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity debt securities, Due within 1 year	$ 951
Held-to-maturity debt securities, After 1 year through 5 years	85,484
Held-to-maturity debt securities, After 5 years through 10 years	2,110
Held-to-maturity debt securities	88,545
Public Service Company of New Mexico [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity debt securities, Due within 1 year	951
Held-to-maturity debt securities, After 1 year through 5 years	78,420
Held-to-maturity debt securities, After 5 years through 10 years	0
Held-to-maturity debt securities	79,371
PNMR and PNM [Member]
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale debt securities, Within 1 year	1,543
Available-for-sale debt securities, After 1 year through 5 years	30,977
Available-for-sale debt securities, After 5 years through 10 years	14,418
Available-for-sale debt securities, After 10 years through 15 years	9,196
Available-for-sale debt securities, After 15 years through 20 years	12,102
Available-for-sale debt securities, After 20 years	23,204
Available-for-sale debt securities	$ 91,440

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Available-for-sale Securities, Debt Maturities, after Fifteen Years Through Twenty Years, Fair Value

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