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Fair Value of Derivative and Other Financial Instruments, Debt Maturities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
PNMR and PNM [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale debt securities, Within 1 year	$ 2,374
Available-for-sale debt securities, After 1 year through 5 years	29,342
Available-for-sale debt securities, After 5 years through 10 years	15,943
Available-for-sale debt securities, After 10 years through 15 years	8,700
Available-for-sale debt securities, After 15 years through 20 years	11,217
Available-for-sale debt securities, After 20 years	23,745
Available-for-sale debt securities	91,321
PNM Resources [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity debt securities, Due within 1 year	3,695
Held-to-maturity debt securities, After 1 year through 5 years	85,520
Held-to-maturity debt securities, After 5 years through 10 years	0
Held-to-maturity debt securities	89,215
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	0
Held-to-maturity debt securities, After 1 year through 5 years	84,198
Held-to-maturity debt securities, After 5 years through 10 years	0
Held-to-maturity debt securities	$ 84,198

X

- Definition

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

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