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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance $ 119,917   $ 119,917   $ 169,341
Recorded investment with an allowance 158,098   158,098   132,004
Unpaid principal balance 290,322   290,322   327,722
Related allowance 24,896   24,896   29,295
Average recorded investment 267,238 $ 239,856 273,070 $ 205,971  
Interest income recognized 655 532 1,043 925  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 5,678   5,678   10,447
Recorded investment with an allowance 9,235   9,235   4,929
Unpaid principal balance 15,349   15,349   15,708
Related allowance 1,402   1,402   466
Average recorded investment 14,257 8,242 14,372 9,072  
Interest income recognized 34 22 77 43  
Total Commercial [Member] | Construction and Land Development [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 831   831   1,106
Recorded investment with an allowance 16   16   832
Unpaid principal balance 1,820   1,820   2,903
Related allowance 1   1   38
Average recorded investment 1,219 7,660 1,492 10,905  
Interest income recognized        
Residential Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 2,338   2,338   2,877
Recorded investment with an allowance 1,128   1,128   1,470
Unpaid principal balance 3,984   3,984   4,865
Related allowance 172   172   91
Average recorded investment 3,352 976 3,572 932  
Interest income recognized 3 2 5 4  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 1   1    
Recorded investment with an allowance 1,052   1,052   2,154
Unpaid principal balance 1,055   1,055   2,155
Related allowance 283   283   267
Average recorded investment 1,601 112 1,876 109  
Interest income recognized 3 1 5 2  
Total Commercial & Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Average recorded investment     251,758 184,953  
Interest income recognized     956 876  
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Average recorded investment     246,374 179,117  
Interest income recognized     934 847  
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Average recorded investment     5,384 5,836  
Interest income recognized     22 $ 29  
Total Commercial & Industrial [Member] | Total Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 111,069   111,069   154,911
Recorded investment with an allowance 146,667   146,667   122,619
Unpaid principal balance 268,114   268,114   302,091
Related allowance 23,038   23,038   28,433
Average recorded investment 246,809 222,866      
Interest income recognized 615 507      
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 107,555   107,555   150,650
Recorded investment with an allowance 142,701   142,701   120,612
Unpaid principal balance 260,544   260,544   295,445
Related allowance 22,758   22,758   28,187
Average recorded investment 241,122 216,907      
Interest income recognized 597 493      
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 3,514   3,514   4,261
Recorded investment with an allowance 3,966   3,966   2,007
Unpaid principal balance 7,570   7,570   6,646
Related allowance 280   $ 280   $ 246
Average recorded investment 5,687 5,959      
Interest income recognized $ 18 $ 14