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Loans and Allowance for Credit Losses (Loans Individually Evaluated Disaggregated by Portfolio Class) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance $ 51,090   $ 51,090   $ 141,091
Recorded investment with an allowance 65,115   65,115   104,560
Unpaid principal balance 181,640   181,640   287,767
Related allowance for loan loss 15,222   15,222   22,385
Average recorded investment 271,342 $ 253,977 265,717 $ 258,697  
Interest income recognized 265 1,542 822 3,346  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 1,332   1,332   373
Recorded investment with an allowance 4,890   4,890   1,525
Unpaid principal balance 7,018   7,018   1,959
Related allowance for loan loss 457   457   18
Average recorded investment 6,761 2,274 5,680 2,480  
Interest income recognized 6 7 12 14  
Total Commercial [Member] | Construction and Land Development [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 667   667    
Recorded investment with an allowance 340   340   277
Unpaid principal balance 1,007   1,007   322
Related allowance for loan loss 55   55   21
Average recorded investment 2,179 19 1,996 45  
Interest income recognized 2   4    
Residential Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 1,921   1,921   3,383
Recorded investment with an allowance 3,789   3,789   1,791
Unpaid principal balance 6,251   6,251   5,709
Related allowance for loan loss 477   477   217
Average recorded investment 5,168 4,743 5,034 4,690  
Interest income recognized 17 2 21 7  
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 1,567   1,567   479
Recorded investment with an allowance 2,403   2,403   1,004
Unpaid principal balance 3,970   3,970   1,906
Related allowance for loan loss 377   377   292
Average recorded investment 2,625 1,515 2,004 1,386  
Interest income recognized 23 18 46 34  
Total Commercial And Industrial [Member] | Total Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 45,603   45,603   136,856
Recorded investment with an allowance 53,693   53,693   99,963
Unpaid principal balance 163,394   163,394   277,871
Related allowance for loan loss 13,856   13,856   21,837
Average recorded investment 254,609 245,426 251,003 250,096  
Interest income recognized 217 1,515 739 3,291  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 42,426   42,426   134,191
Recorded investment with an allowance 46,888   46,888   98,247
Unpaid principal balance 150,630   150,630   270,078
Related allowance for loan loss 12,619   12,619   21,733
Average recorded investment 247,526 228,055 245,320 231,750  
Interest income recognized 217 1,444 739 3,140  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded investment without an allowance 3,177   3,177   2,665
Recorded investment with an allowance 6,805   6,805   1,716
Unpaid principal balance 12,764   12,764   7,793
Related allowance for loan loss 1,237   1,237   $ 104
Average recorded investment $ 7,083 17,371 $ 5,683 18,346  
Interest income recognized   $ 71   $ 151