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Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details) $ in Thousands	Mar. 31, 2017 USD ($)
PNMR and PNM
Available-for-Sale
Within 1 year	$ 3,852
After 1 year through 5 years	23,629
After 5 years through 10 years	29,024
After 10 years through 15 years	3,963
After 15 years through 20 years	8,728
After 20 years	37,244
Available-for-sale debt securities	106,440
PNMR
Held-to-Maturity
Within 1 year	0
After 1 year through 5 years	96,444
After 5 years through 10 years	0
Held-to-maturity debt securities	$ 96,444

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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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