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Loans and Allowance for Credit Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Financing Receivable Impaired [Line Items]  
Recorded Investment Without an Allowance $ 141,091
Recorded Investment With an Allowance 104,560
Unpaid Principle Balance 287,767
Related Allowance 22,385
Average Recorded Investment 247,574
Interest Income Recognized 5,232
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]  
Financing Receivable Impaired [Line Items]  
Recorded Investment Without an Allowance 373
Recorded Investment With an Allowance 1,525
Unpaid Principle Balance 1,959
Related Allowance 18
Average Recorded Investment 2,407
Interest Income Recognized 27
Total Commercial [Member] | Construction and Land Development [Member]  
Financing Receivable Impaired [Line Items]  
Recorded Investment With an Allowance 277
Unpaid Principle Balance 322
Related Allowance 21
Average Recorded Investment 906
Interest Income Recognized 4
Residential Portfolio Segment  
Financing Receivable Impaired [Line Items]  
Recorded Investment Without an Allowance 3,383
Recorded Investment With an Allowance 1,791
Unpaid Principle Balance 5,709
Related Allowance 217
Average Recorded Investment 4,578
Interest Income Recognized 11
Consumer Portfolio Segment  
Financing Receivable Impaired [Line Items]  
Recorded Investment Without an Allowance 479
Recorded Investment With an Allowance 1,004
Unpaid Principle Balance 1,906
Related Allowance 292
Average Recorded Investment 1,464
Interest Income Recognized 77
Total Commercial And Industrial [Member] | Total Commercial [Member]  
Financing Receivable Impaired [Line Items]  
Recorded Investment Without an Allowance 136,856
Recorded Investment With an Allowance 99,963
Unpaid Principle Balance 277,871
Related Allowance 21,837
Average Recorded Investment 238,219
Interest Income Recognized 5,113
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
Recorded Investment With an Allowance 98,247
Unpaid Principle Balance 270,078
Related Allowance 21,733
Average Recorded Investment 223,500
Interest Income Recognized 4,917
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate Owner Occupied  
Financing Receivable Impaired [Line Items]  
Recorded Investment Without an Allowance 2,665
Recorded Investment With an Allowance 1,716
Unpaid Principle Balance 7,793
Related Allowance 104
Average Recorded Investment 14,719
Interest Income Recognized $ 196