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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets (In Thousands) Changes in the carrying amount of goodwill during the years ended December 31, 2020 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at December 31, 2018 | $ | 930,161 |  |  | $ | 2,767 |  |  | $ | 932,928 |
Measurement period adjustments to goodwill from Brand acquisition | 6,755 |  |  | — |  |  | 6,755 |
Balance at December 31, 2019 | $ | 936,916 |  |  | $ | 2,767 |  |  | $ | 939,683 |
Additions to goodwill and other adjustments | — |  |  | — |  |  | — |
Balance at December 31, 2020 | $ | 936,916 |  |  | $ | 2,767 |  |  | $ | 939,683 |
The 2019 addition to goodwill resulted from measurement period adjustments from the Brand Group Holdings, Inc. (“Brand”) acquisition in September 2018 and is primarily related to adjustments on the fair value of loans, debt and other assets. The purchase accounting related to the Brand acquisition is now final. There were no changes to goodwill during the year ended December 31, 2020. The following table provides a summary of finite-lived intangible assets as of the dates presented:
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
December 31, 2020 |  |  |  |  |
Core deposit intangible | $ | 82,492 |  |  | $ | (53,539) |  |  | $ | 28,953 |
Customer relationship intangible | 2,470 |  |  | (1,284) |  |  | 1,186 |
Total finite-lived intangible assets | $ | 84,962 |  |  | $ | (54,823) |  |  | $ | 30,139 |
December 31, 2019 |  |  |  |  |
Core deposit intangible | $ | 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 |
Core deposit intangible amortization expense for the years ended December 31, 2020, 2019 and 2018 was $6,940, $7,965 and $7,048, respectively. Customer relationship intangible amortization expense for the year ended December 31, 2020, 2019, and 2018 was $181, $140, and $131, respectively. The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:
| Core Deposit Intangible |  | Customer Relationship Intangible |  | Total
2021 | $ | 5,860 |  |  | $ | 181 |  |  | $ | 6,041 |
2022 | 4,940 |  |  | 181 |  |  | 5,121 |
2023 | 4,042 |  |  | 181 |  |  | 4,223 |
2024 | 3,498 |  |  | 181 |  |  | 3,679 |
2025 | 3,102 |  |  | 181 |  |  | 3,283 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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