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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2022
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2022 and 2021 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, 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)

Balance at December 31, 2020$20,403 $(98,914)$(78,511)$(672)$(79,183)
 Amounts reclassified from AOCI (pre-tax)
(8,120)6,261 (1,859)(903)(2,762)
Income tax impact of amounts reclassified
2,062 (1,590)472 229 701 
 Other OCI changes (pre-tax)
(968)— (968)1,804 836 
Income tax impact of other OCI changes
246 — 246 (458)(212)
Net after-tax change
(6,780)4,671 (2,109)672 (1,437)
Balance at September 30, 2021$13,623 $(94,243)$(80,620)$— $(80,620)