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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the nine months ended September 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)
(611)4,123 3,512 — 3,512 
Income tax impact of amounts reclassified
155 (1,047)(892)— (892)
Other OCI changes (pre-tax)
645 — 645 (1,538)(893)
Income tax impact of other OCI changes
(164)— (164)391 227 
Net after-tax change
25 3,076 3,101 (1,147)1,954 
Balance at September 30, 2025$239 $(72,846)$(72,607)$(1,147)$(73,754)
Balance at December 31, 2023
$10,652 $(77,157)$(66,505)$3,665 $(62,840)
 Amounts reclassified from AOCI (pre-tax)
(12,932)3,649 (9,283)8,456 (827)
Income tax impact of amounts reclassified
3,285 (927)2,358 (2,148)210 
 Other OCI changes (pre-tax)
362 — 362 (13,689)(13,327)
Income tax impact of other OCI changes
(92)— (92)3,477 3,385 
Net after-tax change
(9,377)2,722 (6,655)(3,904)(10,559)
Balance at September 30, 2024$1,275 $(74,435)$(73,160)$(239)$(73,399)