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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortizable intangible assets: |  |
Gross Carrying Amount | $ 43,284 | $ 41,228
Accumulated Amortization | 24,828 | 20,116
Unamortizable intangible assets: |  |
Goodwill | 234,368 | 234,368
Customer lists |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 6,013 | 6,013
Accumulated Amortization | 2,048 | 1,637
Core deposit intangibles |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 28,440 | 28,440
Accumulated Amortization | 19,650 | 16,469
SBA servicing asset |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 7,528 | 5,472
Accumulated Amortization | 2,028 | 1,053
Other |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 1,303 | 1,303
Accumulated Amortization | $ 1,102 | $ 957

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