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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 2024 and 2023 is as follows:
Accumulated Other Comprehensive Income (Loss)
PNMCorporate and OtherPNMR Consolidated
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)
(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)
Balance at December 31, 2022
$7,422 $(81,757)$(74,335)$8,287 $(66,048)
 Amounts reclassified from AOCI (pre-tax)
(702)1,194 492 (2,224)(1,732)
Income tax impact of amounts reclassified
178 (303)(125)565 440 
 Other OCI changes (pre-tax)
4,170 — 4,170 (168)4,002 
Income tax impact of other OCI changes
(1,059)— (1,059)43 (1,016)
Net after-tax change
2,587 891 3,478 (1,784)1,694 
Balance at March 31, 2023$10,009 $(80,866)$(70,857)$6,503 $(64,354)