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Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | $ 161,227 | $ 147,055
Recorded investment with an allowance | 107,528 | 170,142
Unpaid principal balance | 308,401 | 341,713
Related allowance | 5,114 | 18,566
Average recorded investment | 327,183 | 286,536
Interest income recognized | 8,390 | 3,015
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 1,138 | 5,101
Recorded investment with an allowance | 1,563 | 10,429
Unpaid principal balance | 3,428 | 15,687
Related allowance | 210 | 1,326
Average recorded investment | 9,155 | 14,565
Interest income recognized | 71 | 146
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 100 | 100
Recorded investment with an allowance | 21 | 263
Unpaid principal balance | 121 | 363
Related allowance | 1 | 11
Average recorded investment | 145 | 1,018
Interest income recognized |  | 2
Residential Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 2,058 | 8,245
Recorded investment with an allowance | 1,818 | 2,395
Unpaid principal balance | 4,421 | 13,855
Related allowance | 444 | 189
Average recorded investment | 5,598 | 5,784
Interest income recognized | 18 | 18
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 279 |
Recorded investment with an allowance | 728 | 1,292
Unpaid principal balance | 1,253 | 1,294
Related allowance | 216 | 118
Average recorded investment | 814 | 1,558
Interest income recognized | 39 | 13
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 157,652 | 133,609
Recorded investment with an allowance | 103,398 | 155,763
Unpaid principal balance | 299,178 | 310,514
Related allowance | 4,243 | 16,922
Average recorded investment | 311,471 | 263,611
Interest income recognized | 8,262 | 2,836
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 144,625 | 116,682
Recorded investment with an allowance | 94,759 | 151,199
Unpaid principal balance | 273,290 | 285,685
Related allowance | 3,636 | 16,129
Average recorded investment | 286,146 | 255,710
Interest income recognized | 7,919 | 2,774
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 13,027 | 16,927
Recorded investment with an allowance | 8,639 | 4,564
Unpaid principal balance | 25,888 | 24,829
Related allowance | 607 | 793
Average recorded investment | 25,325 | 7,901
Interest income recognized | $ 343 | $ 62

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