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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 |

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