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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, 2020 | Dec. 31, 2019
--- | --- | ---
Amortizable intangible assets: |  |
Gross Carrying Amount | $ 45,024 | $ 43,532
Accumulated Amortization | 30,507 | 26,315
Unamortizable intangible assets: |  |
Goodwill | 240,972 | 234,368
Customer lists |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 6,013 | 6,013
Accumulated Amortization | 2,575 | 2,185
Core deposit intangibles |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 28,440 | 28,440
Accumulated Amortization | 23,112 | 20,610
SBA servicing asset |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 9,268 | 7,776
Accumulated Amortization | 3,624 | 2,393
Other |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 1,303 | 1,303
Accumulated Amortization | $ 1,196 | $ 1,127

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