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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, 2021 | Dec. 31, 2020
--- | --- | ---
Amortizable intangible assets: |  |
Gross Carrying Amount | $ 43,867 | $ 47,432
Accumulated Amortization | 33,694 | 32,066
Unamortizable intangible assets: |  |
Goodwill | 231,906 | 239,272
Customer lists |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 2,700 | 7,613
Accumulated Amortization | 1,263 | 2,814
Core deposit intangibles |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 28,440 | 28,440
Accumulated Amortization | 25,677 | 23,832
SBA servicing asset |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 11,687 | 9,976
Accumulated Amortization | 5,792 | 4,188
Other |  |
Amortizable intangible assets: |  |
Gross Carrying Amount | 1,040 | 1,403
Accumulated Amortization | $ 962 | $ 1,232

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