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Fair Value of Derivative and Other Financial Instruments - Schedule of Items Recorded at Fair Value By PNM on the Consolidated Balance Sheets by Level of the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investment securities | $ 475,524 | $ 444,408
PNM |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investment securities | 475,524 | 444,408
PNM | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 453,421 |
Unrealized Gains | 324 | 14,316
Uncategorized Collective Investment Trust | 22,103 |
Total investment securities | 475,524 | 444,408
PNM | Recurring Basis | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 150,745 | 93,873
PNM | Recurring Basis | Corporate stocks, common |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 134,553 | 77,422
PNM | Recurring Basis | Corporate stocks, preferred |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value |  | 4,323
PNM | Recurring Basis | Mutual funds and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 135,779 | 57,966
PNM | Recurring Basis | U.S. government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 25,148 | 35,113
Unrealized Gains | 202 | 2,055
PNM | Recurring Basis | International government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value |  | 8,735
Unrealized Gains |  | 104
PNM | Recurring Basis | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 0 | 53,436
Unrealized Gains | 0 | 2,872
PNM | Recurring Basis | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 7,196 | 113,540
Unrealized Gains | 122 | 9,285
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 446,225 |
Total investment securities |  | 264,287
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 150,745 | 93,873
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, common |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 134,553 | 77,422
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, preferred |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value |  | 504
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 135,779 | 57,966
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 25,148 | 34,522
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | International government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value |  | 0
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 0 | 0
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 0 | 0
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 7,196 |
Total investment securities |  | 180,121
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate stocks, common |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 0 | 0
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate stocks, preferred |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value |  | 3,819
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Mutual funds and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 0 | 0
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 0 | 591
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | International government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value |  | 8,735
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | 0 | 53,436
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities, fair value | $ 7,196 | $ 113,540

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