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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance $ 108,118   $ 108,118   $ 169,341
Recorded investment with an allowance 194,279   194,279   132,004
Unpaid principal balance 312,397   312,397   327,722
Related allowance 23,490   23,490   29,295
Average recorded investment 290,206 $ 252,963 278,782 $ 221,634  
Interest income recognized 943 194 1,986 1,119  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 5,160   5,160   10,447
Recorded investment with an allowance 9,135   9,135   4,929
Unpaid principal balance 14,451   14,451   15,708
Related allowance 1,321   1,321   466
Average recorded investment 14,604 7,729 14,449 8,624  
Interest income recognized 35 24 112 67  
Total Commercial [Member] | Construction and Land Development [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 464   464   1,106
Recorded investment with an allowance 16   16   832
Unpaid principal balance 1,445   1,445   2,903
Related allowance 1   1   38
Average recorded investment 663 1,655 1,216 7,821  
Interest income recognized 1 1    
Residential Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 6,311   6,311   2,877
Recorded investment with an allowance 2,630   2,630   1,470
Unpaid principal balance 11,961   11,961   4,865
Related allowance 406   406   91
Average recorded investment 6,204 2,466 4,449 1,444  
Interest income recognized 7 3 12 7  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 1   1    
Recorded investment with an allowance 1,305   1,305   2,154
Unpaid principal balance 1,308   1,308   2,155
Related allowance 405   405   267
Average recorded investment 1,179 826 1,644 348  
Interest income recognized 4 2 9 4  
Total Commercial & Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Average recorded investment     257,024 203,397  
Interest income recognized     1,852 1,041  
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Average recorded investment     251,129 197,382  
Interest income recognized     1,806 1,002  
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Average recorded investment     5,895 6,015  
Interest income recognized     46 $ 39  
Total Commercial & Industrial [Member] | Total Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 96,182   96,182   154,911
Recorded investment with an allowance 181,193   181,193   122,619
Unpaid principal balance 283,232   283,232   302,091
Related allowance 21,357   21,357   28,433
Average recorded investment 267,556 240,287      
Interest income recognized 896 165      
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 92,583   92,583   150,650
Recorded investment with an allowance 178,441   178,441   120,612
Unpaid principal balance 276,879   276,879   295,445
Related allowance 20,880   20,880   28,187
Average recorded investment 260,640 233,913      
Interest income recognized 872 155      
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 3,599   3,599   4,261
Recorded investment with an allowance 2,752   2,752   2,007
Unpaid principal balance 6,353   6,353   6,646
Related allowance 477   $ 477   $ 246
Average recorded investment 6,916 6,374      
Interest income recognized $ 24 $ 10