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Fair Value of Derivative and Other Financial Instruments - Debt Maturities (Details) $ in Thousands	Jun. 30, 2015 USD ($)
PNMR and PNM [Member]
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale debt securities, Within 1 year	$ 4,656
Available-for-sale debt securities, After 1 year through 5 years	21,533
Available-for-sale debt securities, After 5 years through 10 years	22,577
Available-for-sale debt securities, After 10 years through 15 years	10,137
Available-for-sale debt securities, After 15 years through 20 years	10,727
Available-for-sale debt securities, After 20 years	38,658
Available-for-sale debt securities	108,288
PNM Resources [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity debt securities, Due within 1 year	17,230
Held-to-maturity debt securities, After 1 year through 5 years	639
Held-to-maturity debt securities, After 5 years through 10 years	0
Held-to-maturity debt securities	17,869
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	17,230
Held-to-maturity debt securities, After 1 year through 5 years	0
Held-to-maturity debt securities, After 5 years through 10 years	0
Held-to-maturity debt securities	$ 17,230

X

- Definition

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

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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