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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2017 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at January 1, 2017 | $ | 467,767 |  |  | $ | 2,767 |  |  | $ | 470,534 |
Addition to goodwill from acquisition | 140,512 |  |  | — |  |  | 140,512 |
Adjustment to previously recorded goodwill | — |  |  | — |  |  | — |
Balance at September 30, 2017 | $ | 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
September 30, 2017 |  |  |  |  |
Core deposit intangibles | $ | 54,958 |  |  | $ | (29,911 | ) |  | $ | 25,047 |
Customer relationship intangible | 1,970 |  |  | (799 | ) |  | 1,171 |
Total finite-lived intangible assets | $ | 56,928 |  |  | $ | (30,710 | ) |  | $ | 26,218 |
December 31, 2016 |  |  |  |  |
Core deposit intangibles | $ | 47,992 |  |  | $ | (25,188 | ) |  | $ | 22,804 |
Customer relationship intangible | 1,970 |  |  | (700 | ) |  | 1,270 |
Total finite-lived intangible assets | $ | 49,962 |  |  | $ | (25,888 | ) |  | $ | 24,074 |
Current year amortization expense for finite-lived intangible assets | Current year amortization expense for finite-lived intangible assets was as follows for the periods presented.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Amortization expense for: |  |  |  |  |  |  |
Core deposit intangibles | $ | 1,733 |  |  | $ | 1,651 |  |  | $ | 4,723 |  |  | $ | 5,024 |
Customer relationship intangible | 33 |  |  | 33 |  |  | 99 |  |  | 99 |
Total intangible amortization | $ | 1,766 |  |  | $ | 1,684 |  |  | $ | 4,822 |  |  | $ | 5,123 |
Estimated amortization expense of finite-lived intangible assets | The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2017 and the succeeding four years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2017 | $ | 6,399 |  |  | $ | 131 |  |  | $ | 6,530 |
2018 | 6,130 |  |  | 131 |  |  | 6,261 |
2019 | 5,212 |  |  | 131 |  |  | 5,343 |
2020 | 4,186 |  |  | 131 |  |  | 4,317 |
2021 | 3,107 |  |  | 131 |  |  | 3,238 |

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