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Segment financial information (Tables)
 6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended June 30, 2016
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
495,349

 
$
70,749

 
$
146

 
$
566,244

Intersegment revenues (eliminations)
 
46

 
—

 
(46
)
 
—

Revenues
 
495,395

 
70,749

 
100

 
566,244

Income (loss) before income taxes
 
58,340

 
20,224

 
(7,653
)
 
70,911

Income taxes (benefit)
 
21,984

 
6,939

 
(2,613
)
 
26,310

Net income (loss)
 
36,356

 
13,285

 
(5,040
)
 
44,601

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
35,857

 
13,285

 
(5,014
)
 
44,128

Six months ended June 30, 2016
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
977,394

 
$
139,589

 
$
221

 
$
1,117,204

Intersegment revenues (eliminations)
 
53

 
—

 
(53
)
 
—

Revenues
 
977,447

 
139,589

 
168

 
1,117,204

Income (loss) before income taxes
 
98,759

 
39,818

 
(16,540
)
 
122,037

Income taxes (benefit)
 
36,537

 
13,860

 
(5,786
)
 
44,611

Net income (loss)
 
62,222

 
25,958

 
(10,754
)
 
77,426

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
61,224

 
25,958

 
(10,702
)
 
76,480

Total assets (at June 30, 2016)
 
5,721,853

 
6,188,090

 
69,296

 
11,979,239

Three months ended June 30, 2015
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
558,156

 
$
65,783

 
$
(27
)
 
$
623,912

Intersegment revenues (eliminations)
 
7

 
—

 
(7
)
 
—

Revenues
 
558,163

 
65,783

 
(34
)
 
623,912

Income (loss) before income taxes
 
52,451

 
19,726

 
(15,775
)
 
56,402

Income taxes (benefit)
 
19,111

 
6,875

 
(5,075
)
 
20,911

Net income (loss)
 
33,340

 
12,851

 
(10,700
)
 
35,491

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
32,841

 
12,851

 
(10,674
)
 
35,018

Six months ended June 30, 2015
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,131,587

 
$
130,131

 
$
56

 
$
1,261,774

Intersegment revenues (eliminations)
 
18

 
—

 
(18
)
 
—

Revenues
 
1,131,605

 
130,131

 
38

 
1,261,774

Income (loss) before income taxes
 
95,674

 
40,357

 
(27,311
)
 
108,720

Income taxes (benefit)
 
34,961

 
14,031

 
(8,102
)
 
40,890

Net income (loss)
 
60,713

 
26,326

 
(19,209
)
 
67,830

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
59,715

 
26,326

 
(19,157
)
 
66,884

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.