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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)

Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2019 and 2018 is as follows:
 
Accumulated Other Comprehensive Income (Loss)
 
PNM
 
PNMR
 
Unrealized
 
 
 
 
 
Fair Value
 
 
 
Gains on
 
 
 
 
 
Adjustment
 
 
 
Available-for-
 
Pension
 
 
 
for Cash
 
 
 
Sale
 
Liability
 
 
 
Flow
 
 
 
Securities
 
Adjustment
 
Total
 
Hedges
 
Total
 
(In thousands)
Balance at December 31, 2018
$
1,939

 
$
(112,361
)
 
$
(110,422
)
 
$
1,738

 
$
(108,684
)
Amounts reclassified from AOCI (pre-tax)
(12,563
)
 
5,553

 
(7,010
)
 
707

 
(6,303
)
Income tax impact of amounts reclassified
3,191

 
(1,410
)
 
1,781

 
(179
)
 
1,602

Other OCI changes (pre-tax)
23,106

 
—

 
23,106

 
(3,664
)
 
19,442

Income tax impact of other OCI changes
(5,869
)
 
—

 
(5,869
)
 
931

 
(4,938
)
Net after-tax change
7,865

 
4,143

 
12,008

 
(2,205
)
 
9,803

Balance at September 30, 2019
$
9,804

 
$
(108,218
)
 
$
(98,414
)
 
$
(467
)
 
$
(98,881
)
Balance at December 31, 2017, as originally reported
$
13,169

 
$
(110,262
)
 
$
(97,093
)
 
$
1,153

 
$
(95,940
)
Cumulative effect adjustment (Note 7)
(11,208
)
 
—

 
(11,208
)
 
—

 
(11,208
)
Balance at January 1, 2018, as adjusted
1,961

 
(110,262
)
 
(108,301
)
 
1,153

 
(107,148
)
 Amounts reclassified from AOCI (pre-tax)
(3,483
)
 
5,678

 
2,195

 
102

 
2,297

Income tax impact of amounts reclassified
885

 
(1,442
)
 
(557
)
 
(27
)
 
(584
)
 Other OCI changes (pre-tax)
2,872

 
—

 
2,872

 
2,431

 
5,303

Income tax impact of other OCI changes
(730
)
 
—

 
(730
)
 
(618
)
 
(1,348
)
Net after-tax change
(456
)
 
4,236

 
3,780

 
1,888

 
5,668

Balance at September 30, 2018
$
1,505

 
$
(106,026
)
 
$
(104,521
)
 
$
3,041

 
$
(101,480
)