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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

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