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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The following table presents the changes in the carrying amount of goodwill:
| Years Ended December 31,
(dollars in thousands) | 2021 |  | 2020 |  | 2019
Balance at beginning of period | $ | 1,036,994 |  |  | $ | 1,036,994 |  |  | $ | 1,036,258 |
Acquisitions and adjustments | — |  |  | — |  |  | 736 |
Balance at end of period | $ | 1,036,994 |  |  | $ | 1,036,994 |  |  | $ | 1,036,994 |
Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets | The gross carrying amounts and accumulated amortization of other intangible assets were as follows:
(dollars in thousands) | Gross Carrying Amount |  | Accumulated Amortization and Impairment |  | Net Carrying Amount
December 31, 2021 |  |  |  |  |
Core deposit | $ | 92,754 |  |  | $ | (60,036) |  |  | $ | 32,718 |
Customer trust relationships | 16,547 |  |  | (14,587) |  |  | 1,960 |
Total intangible assets | $ | 109,301 |  |  | $ | (74,623) |  |  | $ | 34,678 |
December 31, 2020 |  |  |  |  |
Core deposit | $ | 112,723 |  |  | $ | (69,623) |  |  | $ | 43,100 |
Customer trust relationships | 16,547 |  |  | (13,633) |  |  | 2,914 |
Total intangible assets | $ | 129,270 |  |  | $ | (83,256) |  |  | $ | 46,014 |
Schedule of Estimated Amortization Expense for Future Years | Estimated amortization expense for future years is as follows:
(dollars in thousands) |
2022 | $ | 9,014 |
2023 | 7,053 |
2024 | 5,645 |
2025 | 4,509 |
2026 | 3,386 |
Thereafter | 5,071 |
Total | $ | 34,678 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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