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Segment financial information (Tables)
 3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended March 31, 2016
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
482,045

 
$
68,840

 
$
75

 
$
550,960

Intersegment revenues (eliminations)
 
7

 
—

 
(7
)
 
—

Revenues
 
482,052

 
68,840

 
68

 
550,960

Income (loss) before income taxes
 
40,419

 
19,594

 
(8,887
)
 
51,126

Income taxes (benefit)
 
14,553

 
6,921

 
(3,173
)
 
18,301

Net income (loss)
 
25,866

 
12,673

 
(5,714
)
 
32,825

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
25,367

 
12,673

 
(5,688
)
 
32,352

Total assets (at March 31, 2016)
 
5,662,371

 
6,140,514

 
67,621

 
11,870,506

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

Total assets (at December 31, 2015)*
 
5,672,210

 
6,014,755

 
95,053

 
11,782,018


 
* See Note 11 for the impact to prior period financial information of the adoption of Accounting Standards Update (ASU) No. 2015-03.