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Segment financial information (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended June 30, 2018
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
608,112

 
$
77,104

 
$
61

 
$
685,277

Intersegment revenues (eliminations)
 
14

 
—

 
(14
)
 
—

Revenues
 
$
608,126

 
$
77,104

 
$
47

 
$
685,277

Income (loss) before income taxes
 
$
40,344

 
$
26,514

 
$
(7,276
)
 
$
59,582

Income taxes (benefit)
 
8,676

 
5,953

 
(1,574
)
 
13,055

Net income (loss)
 
31,668

 
20,561

 
(5,702
)
 
46,527

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
$
31,169

 
$
20,561

 
$
(5,676
)
 
$
46,054

Six months ended June 30, 2018
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,178,526

 
$
152,523

 
$
102

 
$
1,331,151

Intersegment revenues (eliminations)
 
27

 
—

 
(27
)
 
—

Revenues
 
$
1,178,553

 
$
152,523

 
$
75

 
$
1,331,151

Income (loss) before income taxes
 
$
77,493

 
$
51,014

 
$
(15,649
)
 
$
112,858

Income taxes (benefit)
 
17,851

 
11,493

 
(3,733
)
 
25,611

Net income (loss)
 
59,642

 
39,521

 
(11,916
)
 
87,247

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
$
58,644

 
$
39,521

 
$
(11,864
)
 
$
86,301

Total assets (at June 30, 2018)
 
$
5,803,714

 
$
6,983,583

 
$
96,807

 
$
12,884,104

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 December 31, 2017)
 
$
5,630,613

 
$
6,798,659

 
$
104,888

 
$
12,534,160