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Segment financial information (Tables)
 6 Months Ended
Jun. 30, 2014
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
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

 
17,048

 
(8,011
)
 
64,163

Income taxes (benefit)
 
20,397

 
5,372

 
(3,500
)
 
22,269

Net income (loss)
 
34,729

 
11,676

 
(4,511
)
 
41,894

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
34,230

 
11,676

 
(4,485
)
 
41,421

 
 
 
 
 
 
 
 
 
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

 
38,672

 
(15,728
)
 
135,236

Income taxes (benefit)
 
41,644

 
12,457

 
(7,159
)
 
46,942

Net income (loss)
 
70,648

 
26,215

 
(8,569
)
 
88,294

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
69,650

 
26,215

 
(8,517
)
 
87,348

Assets (at June 30, 2014)
 
5,199,841

 
5,418,127

 
(825
)
 
10,617,143

 
 
 
 
 
 
 
 
 
Three months ended June 30, 2013
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
728,519

 
$
66,027

 
$
21

 
$
794,567

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
728,525

 
66,027

 
15

 
794,567

Income (loss) before income taxes
 
46,525

 
24,705

 
(7,507
)
 
63,723

Income taxes (benefit)
 
17,333

 
8,786

 
(3,457
)
 
22,662

Net income (loss)
 
29,192

 
15,919

 
(4,050
)
 
41,061

Preferred stock dividends of subsidiaries
 
499

 
—

 
(26
)
 
473

Net income (loss) for common stock
 
28,693

 
15,919

 
(4,024
)
 
40,588

 
 
 
 
 
 
 
 
 
Six months ended June 30, 2013
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
1,445,954

 
$
130,783

 
$
62

 
$
1,576,799

Intersegment revenues (eliminations)
 
12

 
—

 
(12
)
 
—

Revenues
 
1,445,966

 
130,783

 
50

 
1,576,799

Income (loss) before income taxes
 
85,072

 
46,457

 
(15,767
)
 
115,762

Income taxes (benefit)
 
30,952

 
16,383

 
(6,786
)
 
40,549

Net income (loss)
 
54,120

 
30,074

 
(8,981
)
 
75,213

Preferred stock dividends of subsidiaries
 
998

 
—

 
(52
)
 
946

Net income (loss) for common stock
 
53,122

 
30,074

 
(8,929
)
 
74,267

Assets (at December 31, 2013)
 
5,087,129

 
5,243,824

 
9,091

 
10,340,044