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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
Current federal income tax | $ 0 | $ 60 | $ 0
Current state income tax | 231 | 43 | (244)
Deferred federal income tax | 17,574 | (20,372) | 7,716
Deferred state income tax | 3,721 | (4,491) | 648
Amortization of accumulated investment tax credits | (890) | (522) | (345)
Total income taxes (benefit) | 20,636 | (25,282) | 7,775
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Current federal income tax | 0 | (6,266) | (6,644)
Current state income tax | (585) | 449 | (2,661)
Deferred federal income tax | 20,125 | (12,308) | 5,661
Deferred state income tax | 2,560 | (7,590) | (2,080)
Amortization of accumulated investment tax credits | (243) | (247) | (247)
Total income taxes (benefit) | 21,857 | (25,962) | (5,971)
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Current federal income tax | 12,048 | 10,792 | 13,347
Current state income tax | 2,033 | 1,904 | 1,753
Deferred federal income tax | (7,744) | (7,621) | (540)
Deferred state income tax | (29) | (29) | 2,320
Total income taxes (benefit) | $ 6,308 | $ 5,046 | $ 16,880

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