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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, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Amortizable intangible assets: |  |  |  |  |  |
Gross Carrying Amount | $ 74,418 |  | $ 45,114 |  |  |
Accumulated Amortization | 39,539 |  | 32,439 |  |  |
Total | 34,879 |  | 12,675 |  |  |
Unamortizable intangible assets: |  |  |  |  |  |
Goodwill | 478,750 |  | 364,263 |  |  | $ 364,263
Intangibles before servicing assets |  |  |  |  |  |
Amortizable intangible assets: |  |  |  |  |  |
Gross Carrying Amount | 60,690 |  | 31,850 |  |  |
Accumulated Amortization | 29,326 |  | 23,179 |  |  |
Total | 31,364 |  | 8,671 |  |  |
Customer lists |  |  |  |  |  |
Amortizable intangible assets: |  |  |  |  |  |
Gross Carrying Amount | 2,700 |  | 2,700 |  |  |
Accumulated Amortization | 2,087 |  | 1,847 |  |  |
Total | 613 |  | 853 |  |  |
Core deposit intangibles |  |  |  |  |  |
Amortizable intangible assets: |  |  |  |  |  |
Gross Carrying Amount | 57,890 |  | 29,050 |  |  |
Accumulated Amortization | 27,162 |  | 21,274 |  |  |
Total | 30,728 |  | 7,776 |  |  |
Other intangibles |  |  |  |  |  |
Amortizable intangible assets: |  |  |  |  |  |
Gross Carrying Amount | 100 |  | 100 |  |  |
Accumulated Amortization | 77 |  | 58 |  |  |
Total | 23 |  | 42 |  |  |
SBA servicing assets |  |  |  |  |  |
Amortizable intangible assets: |  |  |  |  |  |
Gross Carrying Amount | 13,728 |  | 13,264 |  |  |
Accumulated Amortization | 10,213 |  | 9,260 |  |  |
Total | $ 3,515 | $ 3,781 | $ 4,004 | $ 4,391 | $ 4,967 | $ 5,472

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