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Goodwill and Intangible Assets - Carrying Amounts (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Carrying amount of intangible assets |  |
Gross carrying amount | $ 110,866 | $ 92,866
Accumulated amortization | (50,184) | (44,807)
Net carrying amount | 60,682 | 48,059
Core deposit intangible |  |
Carrying amount of intangible assets |  |
Gross carrying amount | 91,566 | 91,566
Accumulated amortization | (48,765) | (44,775)
Net carrying amount | 42,801 | 46,791
Customer relationship intangible |  |
Carrying amount of intangible assets |  |
Gross carrying amount | 17,000 | 1,300
Accumulated amortization | (1,266) | (32)
Net carrying amount | 15,734 | $ 1,268
Internally developed technology |  |
Carrying amount of intangible assets |  |
Gross carrying amount | 2,300 |
Accumulated amortization | (153) |
Net carrying amount | $ 2,147 |

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