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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 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)
(676
)
 
1,851

 
1,175

 
270

 
1,445

Income tax impact of amounts reclassified
172

 
(470
)
 
(298
)
 
(68
)
 
(366
)
 Other OCI changes (pre-tax)
7,078

 
—

 
7,078

 
(1,225
)
 
5,853

Income tax impact of other OCI changes
(1,798
)
 
—

 
(1,798
)
 
311

 
(1,487
)
Net after-tax change
4,776

 
1,381

 
6,157

 
(712
)
 
5,445

Balance at March 31, 2019
$
6,715

 
$
(110,980
)
 
$
(104,265
)
 
$
1,026

 
$
(103,239
)
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)
(2,629
)
 
1,891

 
(738
)
 
(53
)
 
(791
)
Income tax impact of amounts reclassified
668

 
(480
)
 
188

 
13

 
201

 Other OCI changes (pre-tax)
1,115

 
—

 
1,115

 
1,858

 
2,973

Income tax impact of other OCI changes
(283
)
 
—

 
(283
)
 
(472
)
 
(755
)
Net after-tax change
(1,129
)
 
1,411

 
282

 
1,346

 
1,628

Balance at March 31, 2018
$
832

 
$
(108,851
)
 
$
(108,019
)
 
$
2,499

 
$
(105,520
)