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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 2018 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at January 1, 2018 | $ | 608,279 |  |  | $ | 2,767 |  |  | $ | 611,046 |
Addition to goodwill from acquisition | 316,215 |  |  | — |  |  | 316,215 |
Adjustment to previously recorded goodwill | — |  |  | — |  |  | — |
Balance at September 30, 2018 | $ | 924,494 |  |  | $ | 2,767 |  |  | $ | 927,261 |
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, 2018 |  |  |  |  |
Core deposit intangibles | $ | 82,312 |  |  | $ | (36,497 | ) |  | $ | 45,815 |
Customer relationship intangible | 1,970 |  |  | (931 | ) |  | 1,039 |
Total finite-lived intangible assets | $ | 84,282 |  |  | $ | (37,428 | ) |  | $ | 46,854 |
December 31, 2017 |  |  |  |  |
Core deposit intangibles | $ | 54,958 |  |  | $ | (31,586 | ) |  | $ | 23,372 |
Customer relationship intangible | 1,970 |  |  | (832 | ) |  | 1,138 |
Total finite-lived intangible assets | $ | 56,928 |  |  | $ | (32,418 | ) |  | $ | 24,510 |
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amortization expense for: |  |  |  |  |  |  |
Core deposit intangibles | $ | 1,732 |  |  | $ | 1,733 |  |  | $ | 4,911 |  |  | $ | 4,723 |
Customer relationship intangible | 33 |  |  | 33 |  |  | 99 |  |  | 99 |
Total intangible amortization | $ | 1,765 |  |  | $ | 1,766 |  |  | $ | 5,010 |  |  | $ | 4,822 |
Estimated amortization expense of finite-lived intangible assets | The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2018 and the succeeding four years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2018 | $ | 7,041 |  |  | $ | 131 |  |  | $ | 7,172 |
2019 | 7,947 |  |  | 131 |  |  | 8,078 |
2020 | 6,921 |  |  | 131 |  |  | 7,052 |
2021 | 5,843 |  |  | 131 |  |  | 5,974 |
2022 | 4,923 |  |  | 131 |  |  | 5,054 |

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