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Loans and Allowance for Credit Losses (Loans Individually Evaluated Disaggregated by Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | $ 51,090 |  | $ 51,090 |  | $ 141,091
Recorded investment with an allowance | 65,115 |  | 65,115 |  | 104,560
Unpaid principal balance | 181,640 |  | 181,640 |  | 287,767
Related allowance for loan loss | 15,222 |  | 15,222 |  | 22,385
Average recorded investment | 271,342 | $ 253,977 | 265,717 | $ 258,697 |
Interest income recognized | 265 | 1,542 | 822 | 3,346 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1,332 |  | 1,332 |  | 373
Recorded investment with an allowance | 4,890 |  | 4,890 |  | 1,525
Unpaid principal balance | 7,018 |  | 7,018 |  | 1,959
Related allowance for loan loss | 457 |  | 457 |  | 18
Average recorded investment | 6,761 | 2,274 | 5,680 | 2,480 |
Interest income recognized | 6 | 7 | 12 | 14 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 667 |  | 667 |  |
Recorded investment with an allowance | 340 |  | 340 |  | 277
Unpaid principal balance | 1,007 |  | 1,007 |  | 322
Related allowance for loan loss | 55 |  | 55 |  | 21
Average recorded investment | 2,179 | 19 | 1,996 | 45 |
Interest income recognized | 2 |  | 4 |  |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1,921 |  | 1,921 |  | 3,383
Recorded investment with an allowance | 3,789 |  | 3,789 |  | 1,791
Unpaid principal balance | 6,251 |  | 6,251 |  | 5,709
Related allowance for loan loss | 477 |  | 477 |  | 217
Average recorded investment | 5,168 | 4,743 | 5,034 | 4,690 |
Interest income recognized | 17 | 2 | 21 | 7 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1,567 |  | 1,567 |  | 479
Recorded investment with an allowance | 2,403 |  | 2,403 |  | 1,004
Unpaid principal balance | 3,970 |  | 3,970 |  | 1,906
Related allowance for loan loss | 377 |  | 377 |  | 292
Average recorded investment | 2,625 | 1,515 | 2,004 | 1,386 |
Interest income recognized | 23 | 18 | 46 | 34 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 45,603 |  | 45,603 |  | 136,856
Recorded investment with an allowance | 53,693 |  | 53,693 |  | 99,963
Unpaid principal balance | 163,394 |  | 163,394 |  | 277,871
Related allowance for loan loss | 13,856 |  | 13,856 |  | 21,837
Average recorded investment | 254,609 | 245,426 | 251,003 | 250,096 |
Interest income recognized | 217 | 1,515 | 739 | 3,291 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 42,426 |  | 42,426 |  | 134,191
Recorded investment with an allowance | 46,888 |  | 46,888 |  | 98,247
Unpaid principal balance | 150,630 |  | 150,630 |  | 270,078
Related allowance for loan loss | 12,619 |  | 12,619 |  | 21,733
Average recorded investment | 247,526 | 228,055 | 245,320 | 231,750 |
Interest income recognized | 217 | 1,444 | 739 | 3,140 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 3,177 |  | 3,177 |  | 2,665
Recorded investment with an allowance | 6,805 |  | 6,805 |  | 1,716
Unpaid principal balance | 12,764 |  | 12,764 |  | 7,793
Related allowance for loan loss | 1,237 |  | 1,237 |  | $ 104
Average recorded investment | $ 7,083 | 17,371 | $ 5,683 | 18,346 |
Interest income recognized |  | $ 71 |  | $ 151 |

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