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Condensed Consolidated Statements of Comprehensive Income - TXNM - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net Earnings $ 136,304 $ 136,398 $ 175,114 $ 238,728
Unrealized Gains on Available-for-Sale Debt Securities:        
Net increase in unrealized holding gains arising during the period, net of income tax (expense) of $(36), $(241), $(164), and $(92) 105 708 481 270
Reclassification adjustment for (gains) included in net earnings, net of income tax expense of $69, $93, $155, and $3,285 (204) (273) (456) (9,647)
Pension Liability Adjustment:        
Reclassification adjustment for amortization of experience losses recognized as net periodic benefit cost, net of income tax (benefit) of $(349), $(309), $(1,047), and $(927) 1,025 907 3,076 2,722
Fair Value Adjustment for Cash Flow Hedges:        
Change in fair market value, net of income tax (expense) benefit of $(242), $2,383, $391, and $3,477 713 (6,999) (1,147) (10,212)
Reclassification adjustment for gains included in net earnings, net of income tax (expense) benefit of $0, $(735), $0, and $(2,148) 0 2,158 0 6,308
Total Other Comprehensive Income (Loss) 1,639 (3,499) 1,954 (10,559)
Comprehensive Income 137,943 132,899 177,068 228,169
Comprehensive (Income) Attributable to Valencia Non-controlling Interest (5,462) (5,064) (13,509) (11,891)
Preferred Stock Dividend Requirements of Subsidiary (132) (132) (396) (396)
Comprehensive Income Attributable to TXNM $ 132,349 $ 127,703 $ 163,163 $ 215,882