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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at December 31, 2017 | $ | 608,279 |  |  | $ | 2,767 |  |  | $ | 611,046 |
Addition to goodwill from Brand acquisition | 321,882 |  |  | — |  |  | 321,882 |
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 |
The 2018 addition to goodwill from the Brand acquisition represents the excess of the purchase price over the initial fair value of the assets acquired and liabilities assumed in the transaction. The addition to goodwill in 2019 resulted from measurement period adjustments from the Brand acquisition 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. 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, 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 |
December 31, 2018 |  |  |  |  |
Core deposit intangible | $ | 82,492 |  |  | $ | (38,634 | ) |  | $ | 43,858 |
Customer relationship intangible | 1,970 |  |  | (963 | ) |  | 1,007 |
Total finite-lived intangible assets | $ | 84,462 |  |  | $ | (39,597 | ) |  | $ | 44,865 |
Core deposit intangible amortization expense for the years ended December 31, 2019, 2018 and 2017 was $7,965, $7,048 and $6,399, respectively. Customer relationship intangible amortization expense for the year ended December 31, 2019 was $140, whereas the expense for the same time period in each of 2018 and 2017 was $131. 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
2020 | $ | 6,940 |  |  | $ | 181 |  |  | $ | 7,121 |
2021 | 5,860 |  |  | 181 |  |  | 6,041 |
2022 | 4,940 |  |  | 181 |  |  | 5,121 |
2023 | 4,042 |  |  | 181 |  |  | 4,223 |
2024 | 3,498 |  |  | 181 |  |  | 3,679 |

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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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