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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the six months ended June 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)
(2,580)2,388 (192)1,197 1,005 
Income tax impact of amounts reclassified
655 (606)49 (304)(255)
Other OCI changes (pre-tax)
4,560 — 4,560 3,567 8,127 
Income tax impact of other OCI changes
(1,158)— (1,158)(906)(2,064)
Net after-tax change
1,477 1,782 3,259 3,554 6,813 
Balance at June 30, 2023$8,899 $(79,975)$(71,076)$11,841 $(59,235)

Balance at December 31, 2021$11,715 $(83,651)$(71,936)$— $(71,936)
 Amounts reclassified from AOCI (pre-tax)
(2,917)3,552 635 (1,185)(550)
Income tax impact of amounts reclassified
741 (902)(161)301 140 
 Other OCI changes (pre-tax)
(9,452)— (9,452)3,448 (6,004)
Income tax impact of other OCI changes
2,401 — 2,401 (876)1,525 
Net after-tax change
(9,227)2,650 (6,577)1,688 (4,889)
Balance at June 30, 2022$2,488 $(81,001)$(78,513)$1,688 $(76,825)