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Condensed Consolidated Statements of Changes in Equity - TXNM - USD ($)
$ in Thousands
Total
Total TXNM Common Stockholders’ Equity
Common Stock
AOCI
Retained Earnings
Non- controlling Interest in Valencia
Beginning balance at Dec. 31, 2023 $ 2,399,051 $ 2,349,093 $ 1,624,823 $ (62,840) $ 787,110 $ 49,958
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings before subsidiary preferred stock dividends 238,728 226,837     226,837 11,891
Total other comprehensive income (10,559) (10,559)   (10,559)    
Subsidiary preferred stock dividends (396) (396)     (396)  
Dividends declared on common stock (104,858) (104,858)     (104,858)  
Awards of common stock (7,983) (7,983) (7,983)      
Stock based compensation expense 7,845 7,845 7,845      
Valencia’s transactions with its owner (13,780)         (13,780)
Ending balance at Sep. 30, 2024 2,508,048 2,459,979 1,624,685 (73,399) 908,693 48,069
Beginning balance at Jun. 30, 2024 2,451,680 2,402,748 1,625,251 (69,900) 847,397 48,932
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings before subsidiary preferred stock dividends 136,398 131,334     131,334 5,064
Total other comprehensive income (3,499) (3,499)   (3,499)    
Subsidiary preferred stock dividends (132) (132)     (132)  
Dividends declared on common stock (69,906) (69,906)     (69,906)  
Awards of common stock (1,735) (1,735) (1,735)      
Stock based compensation expense 1,169 1,169 1,169      
Valencia’s transactions with its owner (5,927)         (5,927)
Ending balance at Sep. 30, 2024 2,508,048 2,459,979 1,624,685 (73,399) 908,693 48,069
Beginning balance at Dec. 31, 2024 2,583,285 2,536,385 1,724,444 (75,708) 887,649 46,900
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings before subsidiary preferred stock dividends 175,114 161,605     161,605 13,509
Total other comprehensive income 1,954 1,954   1,954    
Subsidiary preferred stock dividends (396) (396)     (396)  
Dividends declared on common stock (124,644) (124,644)     (124,644)  
Awards of common stock (8,433) (8,433) (8,433)      
Issuance of common stock 842,891 842,891 842,891      
Stock based compensation expense 6,676 6,676 6,676      
Valencia’s transactions with its owner (15,102)         (15,102)
Ending balance at Sep. 30, 2025 3,461,345 3,416,038 2,565,578 (73,754) 924,214 45,307
Beginning balance at Jun. 30, 2025 3,216,794 3,170,765 2,366,770 (75,393) 879,388 46,029
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings before subsidiary preferred stock dividends 136,304 130,842     130,842 5,462
Total other comprehensive income 1,639 1,639   1,639    
Subsidiary preferred stock dividends (132) (132)     (132)  
Dividends declared on common stock (85,884) (85,884)     (85,884)  
Awards of common stock (184) (184) (184)      
Issuance of common stock 197,582 197,582 197,582      
Stock based compensation expense 1,410 1,410 1,410      
Valencia’s transactions with its owner (6,184)         (6,184)
Ending balance at Sep. 30, 2025 $ 3,461,345 $ 3,416,038 $ 2,565,578 $ (73,754) $ 924,214 $ 45,307