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Fair Value of Derivative and Other Financial Instruments - Available for Sale Securities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities for which carrying value exceeds fair value $ 0   $ 0    
Held-to-maturity securities for which carrying value exceeds fair value 0   0    
Impairments considered to be other than temporary     0    
PNM          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 295,026,000   295,026,000   $ 272,977,000
Unrealized Gains 15,321,000   15,321,000   7,449,000
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings (100,000) $ (700,000) 1,000,000 $ 900,000  
Proceeds from sales 91,657,000 69,115,000 358,045,000 194,014,000  
Gross realized gains 7,971,000 9,531,000 16,617,000 20,247,000  
Gross realized (losses) (2,236,000) $ (4,233,000) (5,321,000) $ (10,349,000)  
PNM | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 295,026,000   295,026,000   272,977,000
PNM | Nuclear Decommissioning Trust | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 274,400,000   274,400,000   253,900,000
PNM | Mine Reclamation Trust | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 20,600,000   20,600,000   19,100,000
PNM | Cash and cash equivalents          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 10,318,000   10,318,000   23,683,000
Unrealized Gains 0   0   0
PNM | Cash and cash equivalents | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 10,318,000   10,318,000   23,683,000
PNM | Domestic value          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 69,106,000   69,106,000   34,796,000
Unrealized Gains 4,640,000   4,640,000   1,135,000
PNM | Domestic value | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 69,106,000   69,106,000   34,796,000
PNM | Domestic growth          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 68,147,000   68,147,000   47,595,000
Unrealized Gains 4,542,000   4,542,000   3,032,000
PNM | Domestic growth | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 68,147,000   68,147,000   47,595,000
PNM | International and other          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 38,620,000   38,620,000   27,481,000
Unrealized Gains 3,396,000   3,396,000   2,029,000
PNM | International and other | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 38,620,000   38,620,000   27,481,000
PNM | U.S. Government          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 29,411,000   29,411,000   40,962,000
Unrealized Gains 371,000   371,000   115,000
PNM | U.S. Government | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 29,411,000   29,411,000   40,962,000
PNM | Municipals          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 37,137,000   37,137,000   43,789,000
Unrealized Gains 949,000   949,000   585,000
PNM | Municipals | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 37,137,000   37,137,000   43,789,000
PNM | Corporate and other          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 42,287,000   42,287,000   54,671,000
Unrealized Gains 1,423,000   1,423,000   553,000
PNM | Corporate and other | Fair Value, Measurements, Recurring          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value $ 42,287,000   $ 42,287,000   $ 54,671,000