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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2025
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the six months ended June 30, 2025 and 2024 is as follows:
Accumulated Other Comprehensive Income (Loss)
PNMCorporate and Other
TXNM
Unrealized
Gains on
Available-for-Sale Debt
Securities		Pension
Liability
Adjustment		Fair Value
Adjustment
for Cash
Flow Hedges
TotalTotal
(In thousands)
Balance at December 31, 2024
$214 $(75,922)$(75,708)$— $(75,708)
Amounts reclassified from AOCI (pre-tax)
(338)2,749 2,411 — 2,411 
Income tax impact of amounts reclassified
86 (698)(612)— (612)
Other OCI changes (pre-tax)
504 — 504 (2,493)(1,989)
Income tax impact of other OCI changes
(128)— (128)633 505 
Net after-tax change
124 2,051 2,175 (1,860)315 
Balance at June 30, 2025$338 $(73,871)$(73,533)$(1,860)$(75,393)
Balance at December 31, 2023
$10,652 $(77,157)$(66,505)$3,665 $(62,840)
 Amounts reclassified from AOCI (pre-tax)
(12,566)2,433 (10,133)5,563 (4,570)
Income tax impact of amounts reclassified
3,192 (618)2,574 (1,413)1,161 
 Other OCI changes (pre-tax)
(587)— (587)(4,307)(4,894)
Income tax impact of other OCI changes
149 — 149 1,094 1,243 
Net after-tax change
(9,812)1,815 (7,997)937 (7,060)
Balance at June 30, 2024$840 $(75,342)$(74,502)$4,602 $(69,900)