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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance $ 164,124   $ 164,124   $ 161,227
Recorded investment with an allowance 85,757   85,757   107,528
Unpaid principal balance 291,557   291,557   308,401
Related allowance 9,121   9,121   5,114
Average recorded investment 253,977 $ 354,338 258,697 $ 350,811  
Interest income recognized 1,542 2,142 3,346 3,833  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 385   385   1,138
Recorded investment with an allowance 1,495   1,495   1,563
Unpaid principal balance 1,932   1,932   3,428
Related allowance 93   93   210
Average recorded investment 2,274 11,446 2,480 13,123  
Interest income recognized 7 24 14 49  
Total Commercial [Member] | Construction and Land Development [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance         100
Recorded investment with an allowance 19   19   21
Unpaid principal balance 19   19   121
Related allowance 1   1   1
Average recorded investment 19 113 45 176  
Residential Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 2,669   2,669   2,058
Recorded investment with an allowance 1,420   1,420   1,818
Unpaid principal balance 4,619   4,619   4,421
Related allowance 146   146   444
Average recorded investment 4,743 6,036 4,690 7,762  
Interest income recognized 2 5 7 10  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 494   494   279
Recorded investment with an allowance 1,027   1,027   728
Unpaid principal balance 1,802   1,802   1,253
Related allowance 253   253   216
Average recorded investment 1,515 608 1,386 781  
Interest income recognized 18 9 34 18  
Total Commercial And Industrial [Member] | Total Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 160,576   160,576   157,652
Recorded investment with an allowance 81,796   81,796   103,398
Unpaid principal balance 283,185   283,185   299,178
Related allowance 8,628   8,628   4,243
Average recorded investment 245,426 336,135 250,096 328,969  
Interest income recognized 1,515 2,104 3,291 3,756  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 149,605   149,605   144,625
Recorded investment with an allowance 74,998   74,998   94,759
Unpaid principal balance 260,833   260,833   273,290
Related allowance 8,486   8,486   3,636
Average recorded investment 228,055 307,492 231,750 301,695  
Interest income recognized 1,444 2,002 3,140 3,588  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 10,971   10,971   13,027
Recorded investment with an allowance 6,798   6,798   8,639
Unpaid principal balance 22,352   22,352   25,888
Related allowance 142   142   $ 607
Average recorded investment 17,371 28,643 18,346 27,274  
Interest income recognized $ 71 $ 102 $ 151 $ 168