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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2024 and 2023 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, 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)
Balance at December 31, 2022
$7,422 $(81,757)$(74,335)$8,287 $(66,048)
 Amounts reclassified from AOCI (pre-tax)
(4,111)3,582 (529)5,286 4,757 
Income tax impact of amounts reclassified
1,044 (909)135 (1,343)(1,208)
 Other OCI changes (pre-tax)
2,491 — 2,491 (2,386)105 
Income tax impact of other OCI changes
(632)— (632)606 (26)
Net after-tax change
(1,208)2,673 1,465 2,163 3,628 
Balance at September 30, 2023$6,214 $(79,084)$(72,870)$10,450 $(62,420)