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

 
 

 
 

 
 

Revenues from external customers
 
$
687,396

 
$
80,496

 
$
156

 
$
768,048

Intersegment revenues (eliminations)
 
13

 
—

 
(13
)
 
—

Revenues
 
$
687,409

 
$
80,496

 
$
143

 
$
768,048

Income (loss) before income taxes
 
$
57,354

 
$
26,831

 
$
(6,952
)
 
$
77,233

Income taxes (benefit)
 
7,144

 
5,610

 
(1,892
)
 
10,862

Net income (loss)
 
50,210

 
21,221

 
(5,060
)
 
66,371

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
$
49,712

 
$
21,221

 
$
(5,033
)
 
$
65,900

Nine months ended September 30, 2018
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,865,922

 
$
233,019

 
$
258

 
$
2,099,199

Intersegment revenues (eliminations)
 
40

 
—

 
(40
)
 
—

Revenues
 
$
1,865,962

 
$
233,019

 
$
218

 
$
2,099,199

Income (loss) before income taxes
 
$
134,847

 
$
77,845

 
$
(22,601
)
 
$
190,091

Income taxes (benefit)
 
24,995

 
17,103

 
(5,625
)
 
36,473

Net income (loss)
 
109,852

 
60,742

 
(16,976
)
 
153,618

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
$
108,356

 
$
60,742

 
$
(16,897
)
 
$
152,201

Total assets (at September 30, 2018)
 
$
5,882,127

 
$
6,929,456

 
$
99,971

 
$
12,911,554

Three months ended September 30, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
598,756

 
$
74,289

 
$
140

 
$
673,185

Intersegment revenues (eliminations)
 
13

 
—

 
(13
)
 
—

Revenues
 
$
598,769

 
$
74,289

 
$
127

 
$
673,185

Income (loss) before income taxes
 
$
74,990

 
$
26,764

 
$
(6,615
)
 
$
95,139

Income taxes (benefit)
 
27,005

 
9,172

 
(1,582
)
 
34,595

Net income (loss)
 
47,985

 
17,592

 
(5,033
)
 
60,544

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
$
47,487

 
$
17,592

 
$
(5,006
)
 
$
60,073

Nine months ended September 30, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,674,158

 
$
222,474

 
$
396

 
$
1,897,028

Intersegment revenues (eliminations)
 
97

 
—

 
(97
)
 
—

Revenues
 
$
1,674,255

 
$
222,474

 
$
299

 
$
1,897,028

Income (loss) before income taxes
 
$
150,715

 
$
75,720

 
$
(20,088
)
 
$
206,347

Income taxes (benefit)
 
54,623

 
25,582

 
(8,202
)
 
72,003

Net income (loss)
 
96,092

 
50,138

 
(11,886
)
 
134,344

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
$
94,596

 
$
50,138

 
$
(11,807
)
 
$
132,927

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.