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Segment financial information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment financial information                      
Revenues from external customers                 $ 3,238,470 $ 3,374,995 $ 3,242,335
Intersegment revenues (eliminations)                 0 0 0
Total revenues 826,447 831,229 796,730 784,064 838,147 867,720 854,268 814,860 3,238,470 3,374,995 3,242,335
Depreciation and amortization                 164,728 158,347 167,470
Interest expense                 85,556 89,443 96,575
Income before income taxes                 247,747 217,407 216,052
Income taxes (benefit)                 84,341 76,859 75,932
Net income 39,486 48,707 41,061 34,152 14,309 48,177 39,273 38,789 163,406 140,548 140,120
Preferred stock dividends of subsidiaries                 1,890 1,890 1,890
Net income for common stock 39,013 48,236 40,588 33,679 13,836 47,706 38,800 38,316 161,516 138,658 138,230
Capital expenditures                 353,879 325,480 235,116
Assets 10,340,044       10,149,132       10,340,044 10,149,132 9,594,477
Electric utility
                      
Segment financial information                      
Number of entities involved                 3    
Revenues from external customers                 2,980,139 3,109,353 2,978,547
Intersegment revenues (eliminations)                 33 86 143
Total revenues                 2,980,172 3,109,439 2,978,690
Depreciation and amortization                 159,102 151,496 160,353
Interest expense                 59,279 62,055 60,031
Income before income taxes                 194,041 162,319 163,565
Income taxes (benefit)                 69,117 61,048 61,584
Net income                 124,924 101,271 101,981
Preferred stock dividends of subsidiaries                 1,995 1,995 1,995
Net income for common stock                 122,929 99,276 99,986
Capital expenditures                 342,485 310,091 226,022
Assets 5,087,129       5,108,793       5,087,129 5,108,793 4,674,007
Bank
                      
Segment financial information                      
Revenues from external customers                 258,147 265,539 264,407
Intersegment revenues (eliminations)                 0 0 0
Total revenues                 258,147 265,539 264,407
Depreciation and amortization                 4,230 5,334 5,909
Interest expense                 10,077 11,292 14,469
Income before income taxes                 87,059 89,021 91,536
Income taxes (benefit)                 29,525 30,384 31,693
Net income                 57,534 58,637 59,843
Preferred stock dividends of subsidiaries                 0 0 0
Net income for common stock                 57,534 58,637 59,843
Capital expenditures                 11,193 14,979 8,984
Assets 5,243,824       5,041,673       5,243,824 5,041,673 4,909,974
Other
                      
Segment financial information                      
Revenues from external customers                 184 103 (619)
Intersegment revenues (eliminations)                 (33) (86) (143)
Total revenues                 151 17 (762)
Depreciation and amortization                 1,396 1,517 1,208
Interest expense                 16,200 16,096 22,075
Income before income taxes                 (33,353) (33,933) (39,049)
Income taxes (benefit)                 (14,301) (14,573) (17,345)
Net income                 (19,052) (19,360) (21,704)
Preferred stock dividends of subsidiaries                 (105) (105) (105)
Net income for common stock                 (18,947) (19,255) (21,599)
Capital expenditures                 201 410 110
Assets $ 9,091       $ (1,334)       $ 9,091 $ (1,334) $ 10,496