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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance $ 158,601   $ 158,601   $ 147,055
Recorded investment with an allowance 148,480   148,480   170,142
Unpaid principal balance 330,130   330,130   341,713
Related allowance 23,906   23,906   18,566
Average recorded investment 319,194 $ 290,206 340,271 $ 278,782  
Interest income recognized 2,394 943 6,227 1,986  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 2,977   2,977   5,101
Recorded investment with an allowance 1,638   1,638   10,429
Unpaid principal balance 5,474   5,474   15,687
Related allowance 285   285   1,326
Average recorded investment 6,718 14,604 10,988 14,449  
Interest income recognized 15 35 64 112  
Total Commercial [Member] | Construction and Land Development [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 100   100   100
Recorded investment with an allowance 12   12   263
Unpaid principal balance 112   112   363
Related allowance 1   1   11
Average recorded investment 113 663 155 1,216  
Interest income recognized   1   1  
Residential Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 1,482   1,482   8,245
Recorded investment with an allowance 1,579   1,579   2,395
Unpaid principal balance 3,609   3,609   13,855
Related allowance 163   163   189
Average recorded investment 3,397 6,204 6,307 4,449  
Interest income recognized 4 7 14 12  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 279   279    
Recorded investment with an allowance 611   611   1,292
Unpaid principal balance 1,136   1,136   1,294
Related allowance 131   131   118
Average recorded investment 745 1,179 769 1,644  
Interest income recognized 10 4 28 9  
Total Commercial And Industrial [Member] | Total Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 153,763   153,763   133,609
Recorded investment with an allowance 144,640   144,640   155,763
Unpaid principal balance 319,799   319,799   310,514
Related allowance 23,326   23,326   16,922
Average recorded investment 308,221 267,556 322,052 257,024  
Interest income recognized 2,365 896 6,121 1,852  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 140,504   140,504   116,682
Recorded investment with an allowance 135,462   135,462   151,199
Unpaid principal balance 293,012   293,012   285,685
Related allowance 23,101   23,101   16,129
Average recorded investment 283,519 260,640 295,636 251,129  
Interest income recognized 2,275 872 5,863 1,806  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 13,259   13,259   16,927
Recorded investment with an allowance 9,178   9,178   4,564
Unpaid principal balance 26,787   26,787   24,829
Related allowance 225   225   $ 793
Average recorded investment 24,702 6,916 26,416 5,895  
Interest income recognized $ 90 $ 24 $ 258 $ 46