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Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
PNMR and PNM [Member]  
Available-for-Sale  
Within 1 year $ 3,858
After 1 year through 5 years 24,136
After 5 years through 10 years 26,401
After 10 years through 15 years 10,843
After 15 years through 20 years 10,815
After 20 years 38,745
Available-for-sale debt securities 114,798
PNM Resources [Member]  
Held-to-Maturity  
Within 1 year 8,947
After 1 year through 5 years 665
After 5 years through 10 years 0
After 10 years through 15 years 0
After 15 years through 20 years 0
After 20 years 0
Held-to-maturity debt securities 9,612
Public Service Company of New Mexico [Member]  
Held-to-Maturity  
Within 1 year 8,947
After 1 year through 5 years 0
After 5 years through 10 years 0
After 10 years through 15 years 0
After 15 years through 20 years 0
After 20 years 0
Held-to-maturity debt securities $ 8,947