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Loans and Allowance for Credit Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance $ 141,091 $ 161,227
Recorded investment with an allowance 104,560 107,528
Unpaid principal balance 287,767 308,401
Related allowance 22,385 5,114
Average recorded investment 247,574 327,183
Interest income recognized 5,232 8,390
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 373 1,138
Recorded investment with an allowance 1,525 1,563
Unpaid principal balance 1,959 3,428
Related allowance 18 210
Average recorded investment 2,407 9,155
Interest income recognized 27 71
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance   100
Recorded investment with an allowance 277 21
Unpaid principal balance 322 121
Related allowance 21 1
Average recorded investment 906 145
Interest income recognized 4  
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 3,383 2,058
Recorded investment with an allowance 1,791 1,818
Unpaid principal balance 5,709 4,421
Related allowance 217 444
Average recorded investment 4,578 5,598
Interest income recognized 11 18
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 479 279
Recorded investment with an allowance 1,004 728
Unpaid principal balance 1,906 1,253
Related allowance 292 216
Average recorded investment 1,464 814
Interest income recognized 77 39
Total Commercial And Industrial [Member] | Total Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 136,856 157,652
Recorded investment with an allowance 99,963 103,398
Unpaid principal balance 277,871 299,178
Related allowance 21,837 4,243
Average recorded investment 238,219 311,471
Interest income recognized 5,113 8,262
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 134,191 144,625
Recorded investment with an allowance 98,247 94,759
Unpaid principal balance 270,078 273,290
Related allowance 21,733 3,636
Average recorded investment 223,500 286,146
Interest income recognized 4,917 7,919
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment without an allowance 2,665 13,027
Recorded investment with an allowance 1,716 8,639
Unpaid principal balance 7,793 25,888
Related allowance 104 607
Average recorded investment 14,719 25,325
Interest income recognized $ 196 $ 343