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Earnings Per Share - Schedule of Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net Earnings Attributable to TXNM $ 21,576 $ 48,049 $ 30,499 $ 95,239
Average Number of Common Shares:        
Outstanding during period (in shares) 95,793 90,200 94,235 90,200
Vested awards of restricted stock (in shares) 339 304 348 293
Average Shares – Basic (in shares) 96,132 90,504 94,583 90,493
Dilutive Effect of Common Stock Equivalents:        
Restricted stock (in shares) 65 48 54 40
Average Shares – Diluted (in shares) 96,197 90,552 94,637 90,533
Net Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 0.22 $ 0.53 $ 0.32 $ 1.05
Diluted (in dollars per share) $ 0.22 $ 0.53 $ 0.32 $ 1.05