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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance $ 177,960   $ 177,960   $ 161,227
Recorded investment with an allowance 47,178   47,178   107,528
Unpaid principal balance 269,204   269,204   308,401
Related allowance 12,218   12,218   5,114
Average recorded investment 237,510 $ 319,194 251,635 $ 340,271  
Interest income recognized 1,139 2,394 4,485 6,227  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 1,222   1,222   1,138
Recorded investment with an allowance 1,559   1,559   1,563
Unpaid principal balance 3,793   3,793   3,428
Related allowance 49   49   210
Average recorded investment 2,331 6,718 2,430 10,988  
Interest income recognized 7 15 21 64  
Total Commercial [Member] | Construction and Land Development [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 3,121   3,121   100
Recorded investment with an allowance 264   264   21
Unpaid principal balance 4,123   4,123   121
Related allowance 29   29   1
Average recorded investment 1,702 113 597 155  
Interest income recognized 2   2    
Residential Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 2,665   2,665   2,058
Recorded investment with an allowance 1,636   1,636   1,818
Unpaid principal balance 4,831   4,831   4,421
Related allowance 183   183   444
Average recorded investment 4,195 3,397 4,525 6,307  
Interest income recognized 2 4 9 14  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 494   494   279
Recorded investment with an allowance 1,089   1,089   728
Unpaid principal balance 1,864   1,864   1,253
Related allowance 365   365   216
Average recorded investment 1,552 745 1,442 769  
Interest income recognized 21 10 55 28  
Total Commercial And Industrial [Member] | Total Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 170,458   170,458   157,652
Recorded investment with an allowance 42,630   42,630   103,398
Unpaid principal balance 254,593   254,593   299,178
Related allowance 11,592   11,592   4,243
Average recorded investment 227,730 308,221 242,641 322,052  
Interest income recognized 1,107 2,365 4,398 6,121  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 161,275   161,275   144,625
Recorded investment with an allowance 40,704   40,704   94,759
Unpaid principal balance 239,506   239,506   273,290
Related allowance 11,535   11,535   3,636
Average recorded investment 213,291 283,519 225,597 295,636  
Interest income recognized 1,062 2,275 4,202 5,863  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 9,183   9,183   13,027
Recorded investment with an allowance 1,926   1,926   8,639
Unpaid principal balance 15,087   15,087   25,888
Related allowance 57   57   $ 607
Average recorded investment 14,439 24,702 17,044 26,416  
Interest income recognized $ 45 $ 90 $ 196 $ 258