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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance $ 138,477   $ 138,477   $ 147,055
Recorded investment with an allowance 192,826   192,826   170,142
Unpaid principal balance 347,828   347,828   341,713
Related allowance 20,830   20,830   18,566
Average recorded investment 354,338 $ 267,238 350,811 $ 273,070  
Interest income recognized 2,142 655 3,833 1,043  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 1,765   1,765   5,101
Recorded investment with an allowance 7,055   7,055   10,429
Unpaid principal balance 9,840   9,840   15,687
Related allowance 407   407   1,326
Average recorded investment 11,446 14,257 13,123 14,372  
Interest income recognized 24 34 49 77  
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 13   13   263
Unpaid principal balance 113   113   363
Related allowance 1   1   11
Average recorded investment 113 1,219 176 1,492  
Residential Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 2,430   2,430   8,245
Recorded investment with an allowance 1,303   1,303   2,395
Unpaid principal balance 6,748   6,748   13,855
Related allowance 99   99   189
Average recorded investment 6,036 3,352 7,762 3,572  
Interest income recognized 5 3 10 5  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment with an allowance 599   599   1,292
Unpaid principal balance 599   599   1,294
Related allowance 130   130   118
Average recorded investment 608 1,601 781 1,876  
Interest income recognized 9 3 18 5  
Total Commercial And Industrial [Member] | Total Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 134,182   134,182   133,609
Recorded investment with an allowance 183,856   183,856   155,763
Unpaid principal balance 330,528   330,528   310,514
Related allowance 20,193   20,193   16,922
Average recorded investment 336,135 246,809 328,969 251,758  
Interest income recognized 2,104 615 3,756 956  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 125,440   125,440   116,682
Recorded investment with an allowance 165,631   165,631   151,199
Unpaid principal balance 302,314   302,314   285,685
Related allowance 19,369   19,369   16,129
Average recorded investment 307,492 241,122 301,695 246,374  
Interest income recognized 2,002 597 3,588 934  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 8,742   8,742   16,927
Recorded investment with an allowance 18,225   18,225   4,564
Unpaid principal balance 28,214   28,214   24,829
Related allowance 824   824   $ 793
Average recorded investment 28,643 5,687 27,274 5,384  
Interest income recognized $ 102 $ 18 $ 168 $ 22