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

 
 

 
 

 
 

Revenues from external customers
 
$
687,396

 
$
80,496

 
$
156

 
$
768,048

Intersegment revenues (eliminations)
 
13

 
—

 
(13
)
 
—

Revenues
 
$
687,409

 
$
80,496

 
$
143

 
$
768,048

Income (loss) before income taxes
 
$
57,354

 
$
26,831

 
$
(6,952
)
 
$
77,233

Income taxes (benefit)
 
7,144

 
5,610

 
(1,892
)
 
10,862

Net income (loss)
 
50,210

 
21,221

 
(5,060
)
 
66,371

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
$
49,712

 
$
21,221

 
$
(5,033
)
 
$
65,900

Nine months ended September 30, 2018
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,865,922

 
$
233,019

 
$
258

 
$
2,099,199

Intersegment revenues (eliminations)
 
40

 
—

 
(40
)
 
—

Revenues
 
$
1,865,962

 
$
233,019

 
$
218

 
$
2,099,199

Income (loss) before income taxes
 
$
134,847

 
$
77,845

 
$
(22,601
)
 
$
190,091

Income taxes (benefit)
 
24,995

 
17,103

 
(5,625
)
 
36,473

Net income (loss)
 
109,852

 
60,742

 
(16,976
)
 
153,618

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
$
108,356

 
$
60,742

 
$
(16,897
)
 
$
152,201

Total assets (at September 30, 2018)
 
$
5,882,127

 
$
6,929,456

 
$
99,971

 
$
12,911,554

Three months ended September 30, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
598,756

 
$
74,289

 
$
140

 
$
673,185

Intersegment revenues (eliminations)
 
13

 
—

 
(13
)
 
—

Revenues
 
$
598,769

 
$
74,289

 
$
127

 
$
673,185

Income (loss) before income taxes
 
$
74,990

 
$
26,764

 
$
(6,615
)
 
$
95,139

Income taxes (benefit)
 
27,005

 
9,172

 
(1,582
)
 
34,595

Net income (loss)
 
47,985

 
17,592

 
(5,033
)
 
60,544

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
$
47,487

 
$
17,592

 
$
(5,006
)
 
$
60,073

Nine months ended September 30, 2017
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,674,158

 
$
222,474

 
$
396

 
$
1,897,028

Intersegment revenues (eliminations)
 
97

 
—

 
(97
)
 
—

Revenues
 
$
1,674,255

 
$
222,474

 
$
299

 
$
1,897,028

Income (loss) before income taxes
 
$
150,715

 
$
75,720

 
$
(20,088
)
 
$
206,347

Income taxes (benefit)
 
54,623

 
25,582

 
(8,202
)
 
72,003

Net income (loss)
 
96,092

 
50,138

 
(11,886
)
 
134,344

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
$
94,596

 
$
50,138

 
$
(11,807
)
 
$
132,927

Total assets (at December 31, 2017)
 
$
5,630,613

 
$
6,798,659

 
$
104,888

 
$
12,534,160