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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net Earnings Attributable to TXNM $ 8,923 $ 47,190
Average Number of Common Shares:    
Outstanding during period (in shares) 92,659 90,200
Vested awards of restricted stock (in shares) 358 283
Average Shares – Basic (in shares) 93,017 90,483
Dilutive Effect of Common Stock Equivalents:    
Restricted stock (in shares) 44 31
Average Shares – Diluted (in shares) 93,179 90,514
Net Earnings Per Share of Common Stock:    
Basic (in dollars per share) $ 0.10 $ 0.52
Diluted (in dollars per share) $ 0.10 $ 0.52
TXNM ATM Program    
Dilutive Effect of Common Stock Equivalents:    
TXNM ATM Programs (in shares) 118 0