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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying amounts of goodwill by operating segments | The carrying amounts of goodwill by operating segments for the six months ended June 30, 2020 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at January 1, 2020 | $ | 936,916 |  |  | $ | 2,767 |  |  | $ | 939,683 |
Addition to goodwill from acquisition | — |  |  | — |  |  | — |
Balance at June 30, 2020 | $ | 936,916 |  |  | $ | 2,767 |  |  | $ | 939,683 |
Summary of finite-lived intangible assets | The following table provides a summary of finite-lived intangible assets as of the dates presented:
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
June 30, 2020 |  |  |  |  |
Core deposit intangibles | $ | 82,492 |  |  | $ | (50,238) |  |  | $ | 32,254 |
Customer relationship intangible | 2,470 |  |  | (1,193) |  |  | 1,277 |
Total finite-lived intangible assets | $ | 84,962 |  |  | $ | (51,431) |  |  | $ | 33,531 |
December 31, 2019 |  |  |  |  |
Core deposit intangibles | $ | 82,492 |  |  | $ | (46,599) |  |  | $ | 35,893 |
Customer relationship intangible | 2,470 |  |  | (1,103) |  |  | 1,367 |
Total finite-lived intangible assets | $ | 84,962 |  |  | $ | (47,702) |  |  | $ | 37,260 |
Current year amortization expense for finite-lived intangible assets | Current year amortization expense for finite-lived intangible assets is presented in the table below.
| Three Months Ended |  |  |  | Six Months Ended |  |
| June 30, |  |  |  | June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Amortization expense for: |  |  |  |  |  |  |
Core deposit intangibles | $ | 1,789 |  |  | $ | 2,020 |  |  | $ | 3,639 |  |  | $ | 4,097 |
Customer relationship intangible | 45 |  |  | 33 |  |  | 90 |  |  | 66 |
Total intangible amortization | $ | 1,834 |  |  | $ | 2,053 |  |  | $ | 3,729 |  |  | $ | 4,163 |
Estimated amortization expense of finite-lived intangible assets | The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2020 and the succeeding four years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2020 | $ | 6,939 |  |  | $ | 181 |  |  | $ | 7,120 |
2021 | 5,860 |  |  | 181 |  |  | 6,041 |
2022 | 4,940 |  |  | 181 |  |  | 5,121 |
2023 | 4,044 |  |  | 181 |  |  | 4,225 |
2024 | 3,498 |  |  | 181 |  |  | 3,679 |

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