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Segment financial information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment financial information          
Total revenues $ 867,096 $ 829,168 $ 2,449,502 $ 2,405,967  
Income (loss) before income taxes 74,609 70,748 209,845 186,510  
Income taxes (benefit) 26,323 22,041 73,265 62,590  
Net income 48,286 48,707 136,580 123,920  
Preferred stock dividends of subsidiaries 471 471 1,417 1,417  
Net income for common stock 47,815 48,236 135,163 122,503  
Assets 10,670,471   10,670,471   10,340,044
Electric utility
          
Segment financial information          
Total revenues 803,565 764,054 2,262,056 2,210,020  
Income (loss) before income taxes 62,419 56,573 174,711 141,645  
Income taxes (benefit) 23,042 18,258 64,686 49,210  
Net income 39,377 38,315 110,025 92,435  
Preferred stock dividends of subsidiaries 498 498 1,496 1,496  
Net income for common stock 38,879 37,817 108,529 90,939  
Assets 5,225,162   5,225,162   5,087,129
Bank
          
Segment financial information          
Total revenues 63,536 65,058 187,771 195,841  
Income (loss) before income taxes 19,572 22,808 58,244 69,265  
Income taxes (benefit) 6,312 7,532 18,769 23,915  
Net income 13,260 15,276 39,475 45,350  
Net income for common stock 13,260 15,276 39,475 45,350  
Assets 5,442,336   5,442,336   5,243,824
Other
          
Segment financial information          
Total revenues (5) 56 (325) 106  
Income (loss) before income taxes (7,382) (8,633) (23,110) (24,400)  
Income taxes (benefit) (3,031) (3,749) (10,190) (10,535)  
Net income (4,351) (4,884) (12,920) (13,865)  
Preferred stock dividends of subsidiaries (27) (27) (79) (79)  
Net income for common stock (4,324) (4,857) (12,841) (13,786)  
Assets 2,973   2,973   9,091
Revenues from external customers
          
Segment financial information          
Total revenues     2,449,502 2,405,967  
Revenues from external customers | Electric utility
          
Segment financial information          
Total revenues 803,559 764,048 2,262,038 2,210,002  
Revenues from external customers | Bank
          
Segment financial information          
Total revenues     187,771 195,841  
Revenues from external customers | Other
          
Segment financial information          
Total revenues 1 62 (307) 124  
Intersegment revenues (eliminations) | Electric utility
          
Segment financial information          
Total revenues 6 6 18 18  
Intersegment revenues (eliminations) | Other
          
Segment financial information          
Total revenues $ (6) $ (6) $ (18) $ (18)