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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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