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Fair Value of Derivative and Other Financial Instruments - Maturities of Securities (Details) - PNMR and PNM $ in Thousands	Dec. 31, 2018 USD ($)
Available-for-Sale
Within 1 year	$ 12,488
After 1 year through 5 years	63,600
After 5 years through 10 years	60,344
After 10 years through 15 years	9,984
After 15 years through 20 years	10,904
After 20 years	48,418
Available-for-sale debt securities	$ 205,738

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

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