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Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | $ 174,440 |  | $ 161,227
Recorded investment with an allowance | 83,632 |  | 107,528
Unpaid principal balance | 310,398 |  | 308,401
Related allowance | 2,690 |  | 5,114
Average recorded investment | 263,415 | $ 347,285 |
Interest income recognized | 1,804 | 1,691 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 1,130 |  | 1,138
Recorded investment with an allowance | 1,538 |  | 1,563
Unpaid principal balance | 3,403 |  | 3,428
Related allowance | 143 |  | 210
Average recorded investment | 2,685 | 14,801 |
Interest income recognized | 7 | 25 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance |  |  | 100
Recorded investment with an allowance | 19 |  | 21
Unpaid principal balance | 20 |  | 121
Related allowance | 1 |  | 1
Average recorded investment | 70 | 238 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 3,630 |  | 2,058
Recorded investment with an allowance | 1,767 |  | 1,818
Unpaid principal balance | 5,942 |  | 4,421
Related allowance | 219 |  | 444
Average recorded investment | 4,637 | 9,489 |
Interest income recognized | 5 | 5 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 471 |  | 279
Recorded investment with an allowance | 1,037 |  | 728
Unpaid principal balance | 1,753 |  | 1,253
Related allowance | 347 |  | 216
Average recorded investment | 1,258 | 955 |
Interest income recognized | 16 | 9 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 169,209 |  | 157,652
Recorded investment with an allowance | 79,271 |  | 103,398
Unpaid principal balance | 299,280 |  | 299,178
Related allowance | 1,980 |  | 4,243
Average recorded investment | 254,765 | 321,802 |
Interest income recognized | 1,776 | 1,652 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 158,767 |  | 144,625
Recorded investment with an allowance | 72,739 |  | 94,759
Unpaid principal balance | 278,392 |  | 273,290
Related allowance | 1,775 |  | 3,636
Average recorded investment | 235,445 | 295,897 |
Interest income recognized | 1,696 | 1,586 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 10,442 |  | 13,027
Recorded investment with an allowance | 6,532 |  | 8,639
Unpaid principal balance | 20,888 |  | 25,888
Related allowance | 205 |  | $ 607
Average recorded investment | 19,320 | 25,905 |
Interest income recognized | $ 80 | $ 66 |

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