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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | $ 164,124 |  | $ 164,124 |  | $ 161,227
Recorded investment with an allowance | 85,757 |  | 85,757 |  | 107,528
Unpaid principal balance | 291,557 |  | 291,557 |  | 308,401
Related allowance | 9,121 |  | 9,121 |  | 5,114
Average recorded investment | 253,977 | $ 354,338 | 258,697 | $ 350,811 |
Interest income recognized | 1,542 | 2,142 | 3,346 | 3,833 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 385 |  | 385 |  | 1,138
Recorded investment with an allowance | 1,495 |  | 1,495 |  | 1,563
Unpaid principal balance | 1,932 |  | 1,932 |  | 3,428
Related allowance | 93 |  | 93 |  | 210
Average recorded investment | 2,274 | 11,446 | 2,480 | 13,123 |
Interest income recognized | 7 | 24 | 14 | 49 |
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 |  | 19 |  | 21
Unpaid principal balance | 19 |  | 19 |  | 121
Related allowance | 1 |  | 1 |  | 1
Average recorded investment | 19 | 113 | 45 | 176 |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 2,669 |  | 2,669 |  | 2,058
Recorded investment with an allowance | 1,420 |  | 1,420 |  | 1,818
Unpaid principal balance | 4,619 |  | 4,619 |  | 4,421
Related allowance | 146 |  | 146 |  | 444
Average recorded investment | 4,743 | 6,036 | 4,690 | 7,762 |
Interest income recognized | 2 | 5 | 7 | 10 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 494 |  | 494 |  | 279
Recorded investment with an allowance | 1,027 |  | 1,027 |  | 728
Unpaid principal balance | 1,802 |  | 1,802 |  | 1,253
Related allowance | 253 |  | 253 |  | 216
Average recorded investment | 1,515 | 608 | 1,386 | 781 |
Interest income recognized | 18 | 9 | 34 | 18 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 160,576 |  | 160,576 |  | 157,652
Recorded investment with an allowance | 81,796 |  | 81,796 |  | 103,398
Unpaid principal balance | 283,185 |  | 283,185 |  | 299,178
Related allowance | 8,628 |  | 8,628 |  | 4,243
Average recorded investment | 245,426 | 336,135 | 250,096 | 328,969 |
Interest income recognized | 1,515 | 2,104 | 3,291 | 3,756 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 149,605 |  | 149,605 |  | 144,625
Recorded investment with an allowance | 74,998 |  | 74,998 |  | 94,759
Unpaid principal balance | 260,833 |  | 260,833 |  | 273,290
Related allowance | 8,486 |  | 8,486 |  | 3,636
Average recorded investment | 228,055 | 307,492 | 231,750 | 301,695 |
Interest income recognized | 1,444 | 2,002 | 3,140 | 3,588 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 10,971 |  | 10,971 |  | 13,027
Recorded investment with an allowance | 6,798 |  | 6,798 |  | 8,639
Unpaid principal balance | 22,352 |  | 22,352 |  | 25,888
Related allowance | 142 |  | 142 |  | $ 607
Average recorded investment | 17,371 | 28,643 | 18,346 | 27,274 |
Interest income recognized | $ 71 | $ 102 | $ 151 | $ 168 |

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