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Segment financial information
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Segment financial information
Segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended March 31, 2018
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
570,414

 
$
75,419

 
$
41

 
$
645,874

Intersegment revenues (eliminations)
 
13

 
—

 
(13
)
 
—

Revenues
 
$
570,427

 
$
75,419

 
$
28

 
$
645,874

Income (loss) before income taxes
 
$
37,149

 
$
24,500

 
$
(8,373
)
 
$
53,276

Income taxes (benefit)
 
9,175

 
5,540

 
(2,159
)
 
12,556

Net income (loss)
 
27,974

 
18,960

 
(6,214
)
 
40,720

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
$
27,475

 
$
18,960

 
$
(6,188
)
 
$
40,247

Total assets (at March 31, 2018)
 
$
5,710,569

 
$
6,889,445

 
$
102,704

 
$
12,702,718

Three months ended March 31, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
518,566

 
$
72,856

 
$
140

 
$
591,562

Intersegment revenues (eliminations)
 
45

 
—

 
(45
)
 
—

Revenues
 
$
518,611

 
$
72,856

 
$
95

 
$
591,562

Income before income taxes
 
$
34,722

 
$
24,160

 
$
(7,300
)
 
$
51,582

Income taxes
 
12,758

 
8,347

 
(4,189
)
 
16,916

Net income
 
21,964

 
15,813

 
(3,111
)
 
34,666

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income for common stock
 
$
21,465

 
$
15,813

 
$
(3,085
)
 
$
34,193

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.