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Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance $ 126,992   $ 147,055
Recorded investment with an allowance 250,378   170,142
Unpaid principal balance 392,958   341,713
Related allowance 24,601   18,566
Average recorded investment 347,285 $ 278,903  
Interest income recognized 1,691 388  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 6,055   5,101
Recorded investment with an allowance 8,016   10,429
Unpaid principal balance 14,269   15,687
Related allowance 1,261   1,326
Average recorded investment 14,801 14,487  
Interest income recognized 25 43  
Total Commercial [Member] | Construction and Land Development [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 100   100
Recorded investment with an allowance 13   263
Unpaid principal balance 114   363
Related allowance 1   11
Average recorded investment 238 1,766  
Interest income recognized    
Residential Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 5,861   8,245
Recorded investment with an allowance 2,477   2,395
Unpaid principal balance 11,682   13,855
Related allowance 276   189
Average recorded investment 9,489 3,792  
Interest income recognized 5 2  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 14    
Recorded investment with an allowance 603   1,292
Unpaid principal balance 718   1,294
Related allowance 232   118
Average recorded investment 955 2,152  
Interest income recognized 9 2  
Total Commercial And Industrial [Member] | Total Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 114,962   133,609
Recorded investment with an allowance 239,269   155,763
Unpaid principal balance 366,175   310,514
Related allowance 22,831   16,922
Average recorded investment 321,802 256,706  
Interest income recognized 1,652 341  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 108,898   116,682
Recorded investment with an allowance 215,015   151,199
Unpaid principal balance 335,178   285,685
Related allowance 20,356   16,129
Average recorded investment 295,897 251,625  
Interest income recognized 1,586 337  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 6,064   16,927
Recorded investment with an allowance 24,254   4,564
Unpaid principal balance 30,997   24,829
Related allowance 2,475   $ 793
Average recorded investment 25,905 5,081  
Interest income recognized $ 66 $ 4