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Business Segments (Financial Information For Segments Of The Corporation) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Interest income $ 107,287 $ 97,371  
Interest expense 16,366 20,088  
Net interest income 90,921 77,283  
Provision for loan losses 6,572 8,228  
Non-interest income 31,745 28,432  
Non-interest expense 84,392 72,761  
Intangible amortization 2,281 1,796  
Income tax expense (benefit) 7,839 5,755  
Net income (loss) 21,582 17,175  
Total assets 11,726,063 9,755,281 9,786,483
Total intangibles 714,176 601,475  
Number of reportable segments 4    
Community Banking [Member]
      
Segment Reporting Information [Line Items]      
Interest income 97,427 87,783  
Interest expense 12,824 16,394  
Net interest income 84,603 71,389  
Provision for loan losses 5,238 6,836  
Non-interest income 23,447 20,081  
Non-interest expense 71,793 60,057  
Intangible amortization 2,095 1,606  
Income tax expense (benefit) 7,734 5,836  
Net income (loss) 21,190 17,135  
Total assets 11,534,775 9,553,213  
Total intangibles 689,570 576,112  
Wealth Management [Member]
      
Segment Reporting Information [Line Items]      
Interest income 2 3  
Net interest income 2 3  
Non-interest income 5,882 5,938  
Non-interest expense 4,689 4,933  
Intangible amortization 80 84  
Income tax expense (benefit) 403 333  
Net income (loss) 712 591  
Total assets 19,212 19,518  
Total intangibles 11,552 11,883  
Insurance [Member]
      
Segment Reporting Information [Line Items]      
Interest income 30 33  
Net interest income 30 33  
Non-interest income 3,503 3,558  
Non-interest expense 2,937 3,291  
Intangible amortization 106 106  
Income tax expense (benefit) 174 70  
Net income (loss) 316 124  
Total assets 16,951 18,718  
Total intangibles 11,245 11,671  
Consumer Finance [Member]
      
Segment Reporting Information [Line Items]      
Interest income 8,356 8,070  
Interest expense 971 1,117  
Net interest income 7,385 6,953  
Provision for loan losses 1,166 1,328  
Non-interest income 497 522  
Non-interest expense 4,605 4,324  
Income tax expense (benefit) 808 683  
Net income (loss) 1,303 1,140  
Total assets 167,758 168,643  
Total intangibles 1,809 1,809  
Parent And Other [Member]
      
Segment Reporting Information [Line Items]      
Interest income 1,472 1,482  
Interest expense 2,571 2,577  
Net interest income (1,099) (1,095)  
Provision for loan losses 168 64  
Non-interest income (1,584) (1,667)  
Non-interest expense 368 156  
Income tax expense (benefit) (1,280) (1,167)  
Net income (loss) (1,939) (1,815)  
Total assets $ (12,633) $ (4,811)