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Loans and Allowance for Credit Losses (Loans Individually Evaluated Disaggregated by Portfolio Class) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance $ 43,944   $ 141,091
Recorded investment with an allowance 230,585   104,560
Unpaid principal balance 342,518   287,767
Related allowance 68,494   22,385
Average recorded investment 260,092 $ 263,415  
Interest income recognized 557 1,804  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 2,407   373
Recorded investment with an allowance 4,893   1,525
Unpaid principal balance 8,136   1,959
Related allowance 458   18
Average recorded investment 4,599 2,685  
Interest income recognized 6 7  
Total Commercial [Member] | Construction and Land Development [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 3,192    
Recorded investment with an allowance 158   277
Unpaid principal balance 3,949   322
Related allowance 23   21
Average recorded investment 1,814 70  
Interest income recognized 2    
Residential Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 2,598   3,383
Recorded investment with an allowance 2,027   1,791
Unpaid principal balance 5,160   5,709
Related allowance 312   217
Average recorded investment 4,900 4,637  
Interest income recognized 4 5  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 136   479
Recorded investment with an allowance 1,144   1,004
Unpaid principal balance 1,668   1,906
Related allowance 195   292
Average recorded investment 1,382 1,258  
Interest income recognized 23 16  
Total Commercial And Industrial [Member] | Total Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 35,611   136,856
Recorded investment with an allowance 222,363   99,963
Unpaid principal balance 323,605   277,871
Related allowance 67,506   21,837
Average recorded investment 247,397 254,765  
Interest income recognized 522 1,776  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 34,003   134,191
Recorded investment with an allowance 219,787   98,247
Unpaid principal balance 316,651   270,078
Related allowance 67,404   21,733
Average recorded investment 243,114 235,445  
Interest income recognized 522 1,696  
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded investment without an allowance 1,608   2,665
Recorded investment with an allowance 2,576   1,716
Unpaid principal balance 6,954   7,793
Related allowance 102   $ 104
Average recorded investment $ 4,283 19,320  
Interest income recognized   $ 80