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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying amounts of goodwill by operating segments | The carrying amounts of goodwill by operating segments for the nine months ended September 30, 2019 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at January 1, 2019 | $ | 930,161 |  |  | $ | 2,767 |  |  | $ | 932,928 |
Measurement period adjustment to goodwill from Brand acquisition | 6,755 |  |  | — |  |  | 6,755 |
Balance at September 30, 2019 | $ | 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
September 30, 2019 |  |  |  |  |
Core deposit intangibles | $ | 82,492 |  |  | $ | (44,694 | ) |  | $ | 37,798 |
Customer relationship intangible | 1,970 |  |  | (1,061 | ) |  | 909 |
Total finite-lived intangible assets | $ | 84,462 |  |  | $ | (45,755 | ) |  | $ | 38,707 |
December 31, 2018 |  |  |  |  |
Core deposit intangibles | $ | 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 |
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 |  | Nine Months Ended
| September 30, |  | September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Amortization expense for: |  |  |  |  |  |  |
Core deposit intangibles | $ | 1,963 |  |  | $ | 1,732 |  |  | $ | 6,060 |  |  | $ | 4,911 |
Customer relationship intangible | 33 |  |  | 33 |  |  | 99 |  |  | 99 |
Total intangible amortization | $ | 1,996 |  |  | $ | 1,765 |  |  | $ | 6,159 |  |  | $ | 5,010 |
Estimated amortization expense of finite-lived intangible assets | The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2019 and the succeeding four years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2019 | $ | 7,965 |  |  | $ | 131 |  |  | $ | 8,096 |
2020 | 6,939 |  |  | 131 |  |  | 7,070 |
2021 | 5,860 |  |  | 131 |  |  | 5,991 |
2022 | 4,940 |  |  | 131 |  |  | 5,071 |
2023 | 4,044 |  |  | 131 |  |  | 4,175 |

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