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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | Changes in the carrying amount of goodwill during the years ended December 31, 2017 and 2016 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at December 31, 2015 | $ | 443,104 |  |  | $ | 2,767 |  |  | $ | 445,871 |
Addition to goodwill from KeyWorth acquisition | 20,633 |  |  | — |  |  | 20,633 |
Adjustment to previously recorded goodwill | 4,030 |  |  | — |  |  | 4,030 |
Balance at December 31, 2016 | $ | 467,767 |  |  | $ | 2,767 |  |  | $ | 470,534 |
Addition to goodwill from Metropolitan acquisition | 140,512 |  |  | — |  |  | 140,512 |
Balance at December 31, 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
December 31, 2017 |  |  |  |  |
Core deposit intangible | $ | 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 |
December 31, 2016 |  |  |  |  |
Core deposit intangible | $ | 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 |
Estimated amortization expense of finite-lived intangible assets for future periods | The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal 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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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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