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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2017 and 2016 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, 2016
$
4,320

 
$
(96,748
)
 
$
(92,428
)
 
$
(23
)
 
$
(92,451
)
Amounts reclassified from AOCI (pre-tax)
(11,088
)
 
4,839

 
(6,249
)
 
484

 
(5,765
)
Income tax impact of amounts reclassified
4,302

 
(1,878
)
 
2,424

 
(187
)
 
2,237

 Other OCI changes (pre-tax)
22,302

 
—

 
22,302

 
(278
)
 
22,024

Income tax impact of other OCI changes
(8,654
)
 
—

 
(8,654
)
 
108

 
(8,546
)
Net after-tax change
6,862

 
2,961

 
9,823

 
127

 
9,950

Balance at September 30, 2017
$
11,182

 
$
(93,787
)
 
$
(82,605
)
 
$
104

 
$
(82,501
)
 
 
Balance at December 31, 2015
$
17,346

 
$
(88,822
)
 
$
(71,476
)
 
$
44

 
$
(71,432
)
 Amounts reclassified from AOCI (pre-tax)
(10,135
)
 
4,128

 
(6,007
)
 
573

 
(5,434
)
Income tax impact of amounts reclassified
3,955

 
(1,611
)
 
2,344

 
(224
)
 
2,120

 Other OCI changes (pre-tax)
3,115

 
—

 
3,115

 
(1,305
)
 
1,810

Income tax impact of other OCI changes
(1,216
)
 
—

 
(1,216
)
 
509

 
(707
)
Net after-tax change
(4,281
)
 
2,517

 
(1,764
)
 
(447
)
 
(2,211
)
Balance at September 30, 2016
$
13,065

 
$
(86,305
)
 
$
(73,240
)
 
$
(403
)
 
$
(73,643
)