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Segment financial information
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Segment financial information
Segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended June 30, 2018
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
608,112

 
$
77,104

 
$
61

 
$
685,277

Intersegment revenues (eliminations)
 
14

 
—

 
(14
)
 
—

Revenues
 
$
608,126

 
$
77,104

 
$
47

 
$
685,277

Income (loss) before income taxes
 
$
40,344

 
$
26,514

 
$
(7,276
)
 
$
59,582

Income taxes (benefit)
 
8,676

 
5,953

 
(1,574
)
 
13,055

Net income (loss)
 
31,668

 
20,561

 
(5,702
)
 
46,527

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
$
31,169

 
$
20,561

 
$
(5,676
)
 
$
46,054

Six months ended June 30, 2018
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,178,526

 
$
152,523

 
$
102

 
$
1,331,151

Intersegment revenues (eliminations)
 
27

 
—

 
(27
)
 
—

Revenues
 
$
1,178,553

 
$
152,523

 
$
75

 
$
1,331,151

Income (loss) before income taxes
 
$
77,493

 
$
51,014

 
$
(15,649
)
 
$
112,858

Income taxes (benefit)
 
17,851

 
11,493

 
(3,733
)
 
25,611

Net income (loss)
 
59,642

 
39,521

 
(11,916
)
 
87,247

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
$
58,644

 
$
39,521

 
$
(11,864
)
 
$
86,301

Total assets (at June 30, 2018)
 
$
5,803,714

 
$
6,983,583

 
$
96,807

 
$
12,884,104

Three months ended June 30, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
556,836

 
$
75,329

 
$
116

 
$
632,281

Intersegment revenues (eliminations)
 
39

 
—

 
(39
)
 
—

Revenues
 
$
556,875

 
$
75,329

 
$
77

 
$
632,281

Income (loss) before income taxes
 
$
41,003

 
$
24,796

 
$
(6,173
)
 
$
59,626

Income taxes (benefit)
 
14,860

 
8,063

 
(2,431
)
 
20,492

Net income (loss)
 
26,143

 
16,733

 
(3,742
)
 
39,134

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
$
25,644

 
$
16,733

 
$
(3,716
)
 
$
38,661

Six months ended June 30, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,075,402

 
$
148,185

 
$
256

 
$
1,223,843

Intersegment revenues (eliminations)
 
84

 
—

 
(84
)
 
—

Revenues
 
$
1,075,486

 
$
148,185

 
$
172

 
$
1,223,843

Income (loss) before income taxes
 
$
75,725

 
$
48,956

 
$
(13,473
)
 
$
111,208

Income taxes (benefit)
 
27,618

 
16,410

 
(6,620
)
 
37,408

Net income (loss)
 
48,107

 
32,546

 
(6,853
)
 
73,800

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
$
47,109

 
$
32,546

 
$
(6,801
)
 
$
72,854

Total assets (at December 31, 2017)
 
$
5,630,613

 
$
6,798,659

 
$
104,888

 
$
12,534,160


 
Intercompany electricity sales of the Utilities to the bank and “other” segments are not eliminated because those segments would need to purchase electricity from another source if it were not provided by the Utilities and the profit on such sales is nominal.
Bank fees that ASB charges the Utilities and “other” segments are not eliminated because those segments would pay fees to another financial institution if they were to bank with another institution and the profit on such fees is nominal.
Hamakua Energy’s sales to Hawaii Electric Light (a regulated affiliate) are eliminated in consolidation. Hamakua Energy's profit on electricity sales to Hawaii Electric Light is not required to be eliminated because the PPA was approved by the PUC and it is probable that, through the ratemaking process, future revenue from Hawaii Electric Light’s sale of the electricity will approximate its purchase price from Hamakua Energy under the PPA.