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Segment financial information
 3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Segment financial information
Segment financial information
 
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended March 31, 2015
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
573,431

 
$
64,348

 
$
83

 
$
637,862

Intersegment revenues (eliminations)
 
11

 
—

 
(11
)
 
—

Revenues
 
573,442

 
64,348

 
72

 
637,862

Income (loss) before income taxes
 
43,223

 
20,631

 
(11,536
)
 
52,318

Income taxes (benefit)
 
15,850

 
7,156

 
(3,027
)
 
19,979

Net income (loss)
 
27,373

 
13,475

 
(8,509
)
 
32,339

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
26,874

 
13,475

 
(8,483
)
 
31,866

Assets (at March 31, 2015)
 
5,535,500

 
5,724,877

 
13,070

 
11,273,447

 
 
 
 
 
 
 
 
 
Three months ended March 31, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
720,056

 
$
63,619

 
$
74

 
$
783,749

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
720,062

 
63,619

 
68

 
783,749

Income (loss) before income taxes
 
57,166

 
22,532

 
(7,717
)
 
71,981

Income taxes (benefit)
 
21,247

 
8,133

 
(3,659
)
 
25,721

Net income (loss)
 
35,919

 
14,399

 
(4,058
)
 
46,260

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
35,420

 
14,399

 
(4,032
)
 
45,787

Assets (at December 31, 2014)
 
5,590,457

 
5,566,222

 
28,463

 
11,185,142


 
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, the profit on such sales is nominal and the elimination of electric sales revenues and expenses could distort segment operating income and net income for common stock.
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, the profit on such fees is nominal and the elimination of bank fee income and expenses could distort segment operating income and net income for common stock.