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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
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance $ 174,440   $ 161,227
Recorded investment with an allowance 83,632   107,528
Unpaid principal balance 310,398   308,401
Related allowance 2,690   5,114
Average recorded investment 263,415 $ 347,285  
Interest income recognized 1,804 1,691  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 1,130   1,138
Recorded investment with an allowance 1,538   1,563
Unpaid principal balance 3,403   3,428
Related allowance 143   210
Average recorded investment 2,685 14,801  
Interest income recognized 7 25  
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   21
Unpaid principal balance 20   121
Related allowance 1   1
Average recorded investment 70 238  
Residential Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 3,630   2,058
Recorded investment with an allowance 1,767   1,818
Unpaid principal balance 5,942   4,421
Related allowance 219   444
Average recorded investment 4,637 9,489  
Interest income recognized 5 5  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 471   279
Recorded investment with an allowance 1,037   728
Unpaid principal balance 1,753   1,253
Related allowance 347   216
Average recorded investment 1,258 955  
Interest income recognized 16 9  
Total Commercial And Industrial [Member] | Total Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 169,209   157,652
Recorded investment with an allowance 79,271   103,398
Unpaid principal balance 299,280   299,178
Related allowance 1,980   4,243
Average recorded investment 254,765 321,802  
Interest income recognized 1,776 1,652  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 158,767   144,625
Recorded investment with an allowance 72,739   94,759
Unpaid principal balance 278,392   273,290
Related allowance 1,775   3,636
Average recorded investment 235,445 295,897  
Interest income recognized 1,696 1,586  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 10,442   13,027
Recorded investment with an allowance 6,532   8,639
Unpaid principal balance 20,888   25,888
Related allowance 205   $ 607
Average recorded investment 19,320 25,905  
Interest income recognized $ 80 $ 66