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Fair Value of Derivative and Other Financial Instruments - Debt Maturities (Details) $ in Thousands	Jun. 30, 2016 USD ($)
PNMR and PNM [Member]
Available-for-Sale
Within 1 year	$ 2,370
After 1 year through 5 years	39,510
After 5 years through 10 years	21,671
After 10 years through 15 years	9,784
After 15 years through 20 years	10,028
After 20 years	44,202
Available-for-sale debt securities	127,565
PNM Resources [Member]
Held-to-Maturity
Within 1 year	0
After 1 year through 5 years	134,889
After 5 years through 10 years	0
Held-to-maturity debt securities	$ 134,889

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- 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.

+ References

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth 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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