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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 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 six months ended June 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 | — |  |  | — |  |  | — |
Adjustment to previously recorded goodwill | — |  |  | — |  |  | — |
Balance at June 30, 2018 | $ | 608,279 |  |  | $ | 2,767 |  |  | $ | 611,046 |
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, 2018 |  |  |  |  |
Core deposit intangibles | $ | 54,958 |  |  | $ | (34,765 | ) |  | $ | 20,193 |
Customer relationship intangible | 1,970 |  |  | (898 | ) |  | 1,072 |
Total finite-lived intangible assets | $ | 56,928 |  |  | $ | (35,663 | ) |  | $ | 21,265 |
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 |  | Six Months Ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amortization expense for: |  |  |  |  |  |  |
Core deposit intangibles | $ | 1,561 |  |  | $ | 1,460 |  |  | $ | 3,179 |  |  | $ | 2,990 |
Customer relationship intangible | 33 |  |  | 33 |  |  | 66 |  |  | 66 |
Total intangible amortization | $ | 1,594 |  |  | $ | 1,493 |  |  | $ | 3,245 |  |  | $ | 3,056 |
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 | $ | 6,130 |  |  | $ | 131 |  |  | $ | 6,261 |
2019 | 5,212 |  |  | 131 |  |  | 5,343 |
2020 | 4,186 |  |  | 131 |  |  | 4,317 |
2021 | 3,107 |  |  | 131 |  |  | 3,238 |
2022 | 2,187 |  |  | 131 |  |  | 2,318 |

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