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Loans And Allowance For Loan Losses (Schedule Of Impaired Loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance $ 178,858 $ 203,757  
Recorded Investment, Without ALL 22,563 11,022  
Recorded Investment, With an ALL 144,363 189,264  
Related Allowance 13,549 14,908  
Average Recorded Investment 181,869 212,969 $ 264,608
Interest Income Recognized 7,216 7,777 9,207
Cash-basis interest income recognized 1,800 815 1,000
Total commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 114,738 112,868  
Recorded Investment, Without ALL 22,298 8,220  
Recorded Investment, With an ALL 83,124 103,114  
Related Allowance 10,207 9,515  
Average Recorded Investment 108,317 112,652 118,983
Interest Income Recognized 4,167 3,636 4,009
Total commercial and industrial | Commercial, financial, and agricultural      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 65,150 75,427  
Recorded Investment, Without ALL 22,298 8,220  
Recorded Investment, With an ALL 34,222 65,715  
Related Allowance 7,133 7,406  
Average Recorded Investment 65,976 72,154 58,289
Interest Income Recognized 2,316 2,127 1,876
Total commercial and industrial | Owner-occupied      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 49,588 37,441  
Recorded Investment, Without ALL 0 0  
Recorded Investment, With an ALL 48,902 37,399  
Related Allowance 3,074 2,109  
Average Recorded Investment 42,341 40,498 60,694
Interest Income Recognized 1,851 1,509 2,133
Total commercial real estate      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 35,785 58,636  
Recorded Investment, Without ALL 265 56  
Recorded Investment, With an ALL 32,933 56,840  
Related Allowance 2,598 4,240  
Average Recorded Investment 45,218 69,485 107,987
Interest Income Recognized 1,798 2,603 3,430
Total commercial real estate | Investment properties      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 13,916 23,364  
Recorded Investment, Without ALL 0 0  
Recorded Investment, With an ALL 13,916 23,364  
Related Allowance 1,523 1,100  
Average Recorded Investment 18,564 28,749 38,373
Interest Income Recognized 767 1,178 1,485
Total commercial real estate | 1-4 family properties      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 5,586 15,056  
Recorded Investment, Without ALL 0 0  
Recorded Investment, With an ALL 5,586 15,056  
Related Allowance 131 504  
Average Recorded Investment 9,813 16,099 40,723
Interest Income Recognized 782 1,021 919
Total commercial real estate | Land and development      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 16,283 20,216  
Recorded Investment, Without ALL 265 56  
Recorded Investment, With an ALL 13,431 18,420  
Related Allowance 944 2,636  
Average Recorded Investment 16,841 24,637 28,891
Interest Income Recognized 249 404 1,026
Total consumer      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 28,335 32,253  
Recorded Investment, Without ALL 0 2,746  
Recorded Investment, With an ALL 28,306 29,310  
Related Allowance 744 1,153  
Average Recorded Investment 28,334 30,832 37,638
Interest Income Recognized 1,251 1,538 1,768
Total consumer | Consumer mortgages      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 19,506 18,668  
Recorded Investment, Without ALL 0 0  
Recorded Investment, With an ALL 19,506 18,668  
Related Allowance 343 569  
Average Recorded Investment 19,516 18,319 21,863
Interest Income Recognized 134 376 1,014
Total consumer | Home equity lines      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 3,264 8,039  
Recorded Investment, Without ALL 0 2,746  
Recorded Investment, With an ALL 3,235 5,096  
Related Allowance 224 114  
Average Recorded Investment 3,491 7,748 10,713
Interest Income Recognized 820 896 451
Total consumer | Other consumer loans      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 5,565 5,546  
Recorded Investment, Without ALL 0 0  
Recorded Investment, With an ALL 5,565 5,546  
Related Allowance 177 470  
Average Recorded Investment 5,327 4,765 5,062
Interest Income Recognized $ 297 $ 266 $ 303