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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

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