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Segment financial information (Tables)
 6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended June 30, 2019
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
633,771

 
$
81,687

 
$
27

 
$
715,485

Intersegment revenues (eliminations)
 
13

 
—

 
(13
)
 
—

Revenues
 
$
633,784

 
$
81,687

 
$
14

 
$
715,485

Income (loss) before income taxes
 
$
40,817

 
$
21,292

 
$
(9,415
)
 
$
52,694

Income taxes (benefit)
 
7,744

 
4,276

 
(2,311
)
 
9,709

Net income (loss)
 
33,073

 
17,016

 
(7,104
)
 
42,985

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
$
32,574

 
$
17,016

 
$
(7,078
)
 
$
42,512

Six months ended June 30, 2019
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,212,253

 
$
164,739

 
$
108

 
$
1,377,100

Intersegment revenues (eliminations)
 
26

 
—

 
(26
)
 
—

Revenues
 
$
1,212,279

 
$
164,739

 
$
82

 
$
1,377,100

Income (loss) before income taxes
 
$
82,676

 
$
47,454

 
$
(19,397
)
 
$
110,733

Income taxes (benefit)
 
16,978

 
9,599

 
(4,990
)
 
21,587

Net income (loss)
 
65,698

 
37,855

 
(14,407
)
 
89,146

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
$
64,700

 
$
37,855

 
$
(14,355
)
 
$
88,200

Total assets (at June 30, 2019)
 
$
6,253,846

 
$
7,164,054

 
$
119,866

 
$
13,537,766

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 December 31, 2018)
 
$
5,967,503

 
$
7,027,894

 
$
108,654

 
$
13,104,051