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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the six months ended June 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)
(6,961
)
 
3,226

 
(3,735
)
 
323

 
(3,412
)
Income tax impact of amounts reclassified
2,701

 
(1,252
)
 
1,449

 
(125
)
 
1,324

 Other OCI changes (pre-tax)
14,903

 
—

 
14,903

 
(288
)
 
14,615

Income tax impact of other OCI changes
(5,783
)
 
—

 
(5,783
)
 
112

 
(5,671
)
Net after-tax change
4,860

 
1,974

 
6,834

 
22

 
6,856

Balance at June 30, 2017
$
9,180

 
$
(94,774
)
 
$
(85,594
)
 
$
(1
)
 
$
(85,595
)
 
 
Balance at December 31, 2015
$
17,346

 
$
(88,822
)
 
$
(71,476
)
 
$
44

 
$
(71,432
)
 Amounts reclassified from AOCI (pre-tax)
(5,049
)
 
2,752

 
(2,297
)
 
371

 
(1,926
)
Income tax impact of amounts reclassified
1,970

 
(1,074
)
 
896

 
(145
)
 
751

 Other OCI changes (pre-tax)
(1,695
)
 
—

 
(1,695
)
 
(1,746
)
 
(3,441
)
Income tax impact of other OCI changes
661

 
—

 
661

 
681

 
1,342

Net after-tax change
(4,113
)
 
1,678

 
(2,435
)
 
(839
)
 
(3,274
)
Balance at June 30, 2016
$
13,233

 
$
(87,144
)
 
$
(73,911
)
 
$
(795
)
 
$
(74,706
)