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Segment financial information (Tables)
 6 Months Ended
Jun. 30, 2015
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
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

Assets (at June 30, 2015)
 
5,634,307

 
5,777,098

 
28,226

 
11,439,631

Three months ended June 30, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
738,423

 
$
60,616

 
$
(382
)
 
$
798,657

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
738,429

 
60,616

 
(388
)
 
798,657

Income (loss) before income taxes
 
55,126

 
17,956

 
(8,011
)
 
65,071

Income taxes (benefit)
 
20,397

 
6,420

 
(3,500
)
 
23,317

Net income (loss)
 
34,729

 
11,536

 
(4,511
)
 
41,754

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
34,230

 
11,536

 
(4,485
)
 
41,281

Six months ended June 30, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,458,479

 
$
124,235

 
$
(308
)
 
$
1,582,406

Intersegment revenues (eliminations)
 
12

 
—

 
(12
)
 
—

Revenues
 
1,458,491

 
124,235

 
(320
)
 
1,582,406

Income (loss) before income taxes
 
112,292

 
40,488

 
(15,728
)
 
137,052

Income taxes (benefit)
 
41,644

 
14,553

 
(7,159
)
 
49,038

Net income (loss)
 
70,648

 
25,935

 
(8,569
)
 
88,014

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
69,650

 
25,935

 
(8,517
)
 
87,068

Assets (at December 31, 2014)
 
5,590,457

 
5,566,222

 
28,463

 
11,185,142