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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - TXNM ENERGY, INC. AND SUBSIDIARIES - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net earnings $ 168,001 $ 136,304 $ 251,396 $ 175,114
Unrealized Gains on Available-for-Sale Debt Securities:        
Net increase in unrealized holding gains arising during the period, net of income tax (expense) of $(7), $(36), $(24), and $(164) 21 105 71 481
Reclassification adjustment for (gains) included in net earnings, net of income tax expense of $28, $69, $93, and $155 (82) (204) (273) (456)
Pension Liability Adjustment:        
Reclassification adjustment for amortization of experience losses recognized as net periodic benefit cost, net of income tax (benefit) of $(16), $(349), $(383), and $(1,047) 46 1,025 1,124 3,076
Fair Value Adjustment for Cash Flow Hedges:        
Change in fair market value, net of income tax (expense) benefit of $0, $(242), $0, and $391 0 713 0 (1,147)
Reclassification adjustment for amortization of losses recognized in net earnings, net of income tax (expense) benefit of $(12), $0, $(36), and $0 35 0 105 0
Total Other Comprehensive Income (Loss) 20 1,639 1,027 1,954
Comprehensive Income 168,021 137,943 252,423 177,068
Comprehensive (Income) Attributable to Valencia Non-controlling Interest (4,440) (5,462) (12,570) (13,509)
Preferred Stock Dividend Requirements of Subsidiary (132) (132) (396) (396)
Comprehensive Income Attributable to TXNM $ 163,449 $ 132,349 $ 239,457 $ 163,163