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Goodwill and Other Intangible Assets (Summary of the Gross Carrying Amount and Accumulated Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortizable intangible assets: |  |
Gross Carrying Amount | $ 41,228 | $ 37,790
Accumulated Amortization | 20,116 | 13,353
Unamortizable intangible assets: |  |
Goodwill | 234,368 | 233,070
Customer Lists [Member] |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 6,013 | 6,013
Accumulated Amortization | 1,637 | 1,090
Core Deposit Intangible [Member] |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 28,440 | 28,280
Accumulated Amortization | 16,469 | 11,475
SBA servicing asset [Member] |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 5,472 | 2,194
Accumulated Amortization | 1,053 | 207
Other Intangible Assets [Member] |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 1,303 | 1,303
Accumulated Amortization | $ 957 | $ 581

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