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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net Earnings Attributable to TXNM $ 131,202 $ 37,726 $ 226,441 $ 138,045
Average Number of Common Shares:        
Outstanding during period (in shares) 90,200 85,835 90,200 85,835
Vested awards of restricted stock (in shares) 330 254 306 257
Average Shares – Basic (in shares) 90,530 86,089 90,506 86,092
Dilutive Effect of Common Stock Equivalents:        
Restricted stock (in shares) 53 32 44 36
Average Shares – Diluted (in shares) 90,605 86,129 90,552 86,151
Net Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 1.45 $ 0.44 $ 2.50 $ 1.60
Diluted (in dollars per share) $ 1.45 $ 0.44 $ 2.50 $ 1.60
2023 Forward Sale Agreements        
Dilutive Effect of Common Stock Equivalents:        
Forward Sale Agreements (in shares) 0 8 0 23
2024 Forward Sale Agreements        
Dilutive Effect of Common Stock Equivalents:        
Forward Sale Agreements (in shares) 22 0 2 0