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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill | Goodwill and intangible assets consist of the following:
(Dollars in thousands) | September 30, 2023 |  | December 31, 2022
Goodwill | $ | 233,709 |  |  | $ | 233,709 |
| September 30, 2023 |  | December 31, 2022
(Dollars in thousands) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Core deposit intangibles | $ | 43,578 |  |  | $ | (37,490) |  |  | $ | 6,088 |  |  | $ | 43,578 |  |  | $ | (35,347) |  |  | $ | 8,231 |
Software intangible assets | 16,932 |  |  | (9,877) |  |  | 7,055 |  |  | 16,932 |  |  | (6,702) |  |  | 10,230 |
Other intangible assets | 33,452 |  |  | (20,195) |  |  | 13,257 |  |  | 30,410 |  |  | (16,813) |  |  | 13,597 |
| $ | 93,962 |  |  | $ | (67,562) |  |  | $ | 26,400 |  |  | $ | 90,920 |  |  | $ | (58,862) |  |  | $ | 32,058 |
Schedule of Changes in Goodwill and Intangible Assets | The changes in goodwill and intangible assets during the three and nine months ended September 30, 2023 and 2022 are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(Dollars in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Beginning balance | $ | 262,958 |  |  | $ | 270,666 |  |  | $ | 265,767 |  |  | $ | 276,856 |
Acquired intangible assets | — |  |  | 851 |  |  | 3,042 |  |  | 851 |
Acquired goodwill - measurement period adjustment | — |  |  | — |  |  | — |  |  | (18) |
Goodwill transferred to assets held for sale | — |  |  | — |  |  | — |  |  | (3,217) |
Intangible assets transferred to assets held for sale | — |  |  | — |  |  | — |  |  | (1,394) |
Goodwill transferred from assets held for sale | — |  |  | — |  |  | — |  |  | 3,217 |
Intangible assets transferred from assets held for sale | — |  |  | — |  |  | — |  |  | 1,394 |
Amortization of intangibles | (2,849) |  |  | (2,913) |  |  | (8,700) |  |  | (9,085) |
Ending balance | $ | 260,109 |  |  | $ | 268,604 |  |  | $ | 260,109 |  |  | $ | 268,604 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 + Details
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