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Segment financial information (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended June 30, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
556,836

 
$
75,329

 
$
116

 
$
632,281

Intersegment revenues (eliminations)
 
39

 
—

 
(39
)
 
—

Revenues
 
$
556,875

 
$
75,329

 
$
77

 
$
632,281

Income (loss) before income taxes
 
$
41,003

 
$
24,796

 
$
(6,173
)
 
$
59,626

Income taxes (benefit)
 
14,860

 
8,063

 
(2,431
)
 
20,492

Net income (loss)
 
26,143

 
16,733

 
(3,742
)
 
39,134

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
$
25,644

 
$
16,733

 
$
(3,716
)
 
$
38,661

Six months ended June 30, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,075,402

 
$
148,185

 
$
256

 
$
1,223,843

Intersegment revenues (eliminations)
 
84

 
—

 
(84
)
 
—

Revenues
 
$
1,075,486

 
$
148,185

 
$
172

 
$
1,223,843

Income (loss) before income taxes
 
$
75,725

 
$
48,956

 
$
(13,473
)
 
$
111,208

Income taxes (benefit)
 
27,618

 
16,410

 
(6,620
)
 
37,408

Net income (loss)
 
48,107

 
32,546

 
(6,853
)
 
73,800

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
$
47,109

 
$
32,546

 
$
(6,801
)
 
$
72,854

Total assets (at June 30, 2017)
 
$
6,071,155

 
$
6,610,877

 
$
11,773

 
$
12,693,805

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 December 31, 2016)
 
$
5,975,428

 
$
6,421,357

 
$
28,721

 
$
12,425,506