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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2024
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the six months ended June 30, 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)
(12,566)2,433 (10,133)5,563 (4,570)
Income tax impact of amounts reclassified
3,192 (618)2,574 (1,413)1,161 
Other OCI changes (pre-tax)
(587)— (587)(4,307)(4,894)
Income tax impact of other OCI changes
149 — 149 1,094 1,243 
Net after-tax change
(9,812)1,815 (7,997)937 (7,060)
Balance at June 30, 2024$840 $(75,342)$(74,502)$4,602 $(69,900)
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)