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Segment financial information (Tables)
 9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended September 30, 2013
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
766,109

 
$
65,058

 
$
62

 
$
831,229

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
766,115

 
65,058

 
56

 
831,229

Income (loss) before income taxes
 
57,373

 
22,808

 
(8,633
)
 
71,548

Income taxes (benefit)
 
19,058

 
7,532

 
(3,749
)
 
22,841

Net income (loss)
 
38,315

 
15,276

 
(4,884
)
 
48,707

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
37,817

 
15,276

 
(4,857
)
 
48,236

 
 
 
 
 
 
 
 
 
Nine months ended September 30, 2013
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
2,216,058

 
$
195,841

 
$
124

 
$
2,412,023

Intersegment revenues (eliminations)
 
18

 
—

 
(18
)
 
—

Revenues
 
2,216,076

 
195,841

 
106

 
2,412,023

Income (loss) before income taxes
 
144,212

 
69,265

 
(24,400
)
 
189,077

Income taxes (benefit)
 
51,777

 
23,915

 
(10,535
)
 
65,157

Net income (loss)
 
92,435

 
45,350

 
(13,865
)
 
123,920

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
90,939

 
45,350

 
(13,786
)
 
122,503

Assets (at September 30, 2013)
 
5,269,758

 
5,159,372

 
(118
)
 
10,429,012

 
 
 
 
 
 
 
 
 
Three months ended September 30, 2012
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
801,089

 
$
66,596

 
$
35

 
$
867,720

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
801,095

 
66,596

 
29

 
867,720

Income (loss) before income taxes
 
61,268

 
21,627

 
(8,914
)
 
73,981

Income taxes (benefit)
 
22,395

 
7,419

 
(4,010
)
 
25,804

Net income (loss)
 
38,873

 
14,208

 
(4,904
)
 
48,177

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
38,375

 
14,208

 
(4,877
)
 
47,706

 
 
 
 
 
 
 
 
 
Nine months ended September 30, 2012
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
2,340,202

 
$
196,569

 
$
77

 
$
2,536,848

Intersegment revenues (eliminations)
 
55

 
—

 
(55
)
 
—

Revenues
 
2,340,257

 
196,569

 
22

 
2,536,848

Income (loss) before income taxes
 
154,976

 
66,964

 
(25,775
)
 
196,165

Income taxes (benefit)
 
58,429

 
22,690

 
(11,193
)
 
69,926

Net income (loss)
 
96,547

 
44,274

 
(14,582
)
 
126,239

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
95,051

 
44,274

 
(14,503
)
 
124,822

Assets (at December 31, 2012)
 
5,108,793

 
5,041,673

 
(1,334
)
 
10,149,132