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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2023 and 2022 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, 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)

Balance at December 31, 2021$11,715 $(83,651)$(71,936)$— $(71,936)
 Amounts reclassified from AOCI (pre-tax)
(3,426)5,328 1,902 (1,767)135 
Income tax impact of amounts reclassified
870 (1,353)(483)449 (34)
 Other OCI changes (pre-tax)
(8,170)— (8,170)10,391 2,221 
Income tax impact of other OCI changes
2,075 — 2,075 (2,640)(565)
Net after-tax change
(8,651)3,975 (4,676)6,433 1,757 
Balance at September 30, 2022$3,064 $(79,676)$(76,612)$6,433 $(70,179)