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Segment financial information (Tables)
 9 Months Ended
Sep. 30, 2014
Segment Reporting [Abstract]  
Schedule of segment financial information
(in thousands) 
 
Electric utility
 
Bank
 
Other
 
Total
Three months ended September 30, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
803,559

 
$
63,536

 
$
1

 
$
867,096

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
803,565

 
63,536

 
(5
)
 
867,096

Income (loss) before income taxes
 
62,419

 
19,572

 
(7,382
)
 
74,609

Income taxes (benefit)
 
23,042

 
6,312

 
(3,031
)
 
26,323

Net income (loss)
 
39,377

 
13,260

 
(4,351
)
 
48,286

Preferred stock dividends of subsidiaries
 
498

 
—

 
(27
)
 
471

Net income (loss) for common stock
 
38,879

 
13,260

 
(4,324
)
 
47,815

 
 
 
 
 
 
 
 
 
Nine months ended September 30, 2014
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
2,262,038

 
$
187,771

 
$
(307
)
 
$
2,449,502

Intersegment revenues (eliminations)
 
18

 
—

 
(18
)
 
—

Revenues
 
2,262,056

 
187,771

 
(325
)
 
2,449,502

Income (loss) before income taxes
 
174,711

 
58,244

 
(23,110
)
 
209,845

Income taxes (benefit)
 
64,686

 
18,769

 
(10,190
)
 
73,265

Net income (loss)
 
110,025

 
39,475

 
(12,920
)
 
136,580

Preferred stock dividends of subsidiaries
 
1,496

 
—

 
(79
)
 
1,417

Net income (loss) for common stock
 
108,529

 
39,475

 
(12,841
)
 
135,163

Assets (at September 30, 2014)
 
5,225,162

 
5,442,336

 
2,973

 
10,670,471

 
 
 
 
 
 
 
 
 
Three months ended September 30, 2013
 
 

 
 

 
 

 
 

Revenues from external customers
 
$
764,048

 
$
65,058

 
$
62

 
$
829,168

Intersegment revenues (eliminations)
 
6

 
—

 
(6
)
 
—

Revenues
 
764,054

 
65,058

 
56

 
829,168

Income (loss) before income taxes
 
56,573

 
22,808

 
(8,633
)
 
70,748

Income taxes (benefit)
 
18,258

 
7,532

 
(3,749
)
 
22,041

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
 
$
2,210,002

 
$
195,841

 
$
124

 
$
2,405,967

Intersegment revenues (eliminations)
 
18

 
—

 
(18
)
 
—

Revenues
 
2,210,020

 
195,841

 
106

 
2,405,967

Income (loss) before income taxes
 
141,645

 
69,265

 
(24,400
)
 
186,510

Income taxes (benefit)
 
49,210

 
23,915

 
(10,535
)
 
62,590

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 December 31, 2013)
 
5,087,129

 
5,243,824

 
9,091

 
10,340,044