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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2025
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 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)
(137)1,374 1,237 — 1,237 
Income tax impact of amounts reclassified
35 (349)(314)— (314)
Other OCI changes (pre-tax)
267 — 267 — 267 
Income tax impact of other OCI changes
(68)— (68)— (68)
Net after-tax change
97 1,025 1,122 — 1,122 
Balance at March 31, 2025$311 $(74,897)$(74,586)$— $(74,586)
Balance at December 31, 2023
$10,652 $(77,157)$(66,505)$3,665 $(62,840)
 Amounts reclassified from AOCI (pre-tax)
(10,910)1,216 (9,694)2,745 (6,949)
Income tax impact of amounts reclassified
2,771 (309)2,462 (697)1,765 
 Other OCI changes (pre-tax)
491 — 491 67 558 
Income tax impact of other OCI changes
(125)— (125)(17)(142)
Net after-tax change
(7,773)907 (6,866)2,098 (4,768)
Balance at March 31, 2024$2,879 $(76,250)$(73,371)$5,763 $(67,608)