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Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details) $ in Thousands	Jun. 30, 2017 USD ($)
Held-to-Maturity
Within 1 year	$ 0
After 1 year through 5 years	86,070
After 5 years through 10 years	0
Held-to-maturity debt securities	86,070
PNMR and PNM
Available-for-Sale
Within 1 year	4,426
After 1 year through 5 years	22,201
After 5 years through 10 years	27,997
After 10 years through 15 years	4,324
After 15 years through 20 years	10,623
After 20 years	39,264
Available-for-sale debt securities	$ 108,835

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

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