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Equity Method Investment - Schedule of Net Earnings and Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Statement [Abstract]      
Operating Revenues $ 1,971,199 $ 1,939,198 $ 2,249,555
Balance Sheet Related Disclosures [Abstract]      
Current assets 498,836 475,543  
Total assets 11,211,733 10,252,605 9,257,377
Total current liabilities 1,775,098 1,230,760  
Total TXNM common stockholders’ equity 2,536,385 2,349,093  
NMRD      
Income Statement [Abstract]      
Operating Revenues 3,204 13,629 12,505
Operating expenses 3,378 8,228 9,591
Net earnings (174) 5,401 $ 2,914
Balance Sheet Related Disclosures [Abstract]      
Current assets 0 2,589  
Net property, plant, and equipment 0 235,791  
Non-current assets 0 1,849  
Total assets 0 240,229  
Total current liabilities 0 730  
Non-current liabilities 0 358  
Total TXNM common stockholders’ equity $ 0 $ 239,141