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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net Earnings Attributable to TXNM $ 130,710 $ 131,202 $ 161,209 $ 226,441
Average Number of Common Shares:        
Outstanding during period (in shares) 107,015 90,200 98,542 90,200
Vested awards of restricted stock (in shares) 346 330 347 306
Average Shares – Basic (in shares) 107,361 90,530 98,889 90,506
Dilutive Effect of Common Stock Equivalents:        
Average Shares – Diluted (in shares) 107,417 90,605 99,042 90,552
Net Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 1.22 $ 1.45 $ 1.63 $ 2.50
Diluted (in dollars per share) $ 1.22 $ 1.45 $ 1.63 $ 2.50
Restricted Stock        
Dilutive Effect of Common Stock Equivalents:        
Restricted stock (in shares) 55 53 55 44
TXNM ATM Program        
Dilutive Effect of Common Stock Equivalents:        
TXNM ATM Programs (in shares) 1 22 98 2