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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the carrying amount of goodwill | The carrying amounts of goodwill by operating segments for the three months ended March 31, 2017 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at January 1, 2017 | $ | 467,767 |  |  | $ | 2,767 |  |  | $ | 470,534 |
Addition to goodwill from acquisition | — |  |  | — |  |  | — |
Adjustment to previously recorded goodwill | — |  |  | — |  |  | — |
Balance at March 31, 2017 | $ | 467,767 |  |  | $ | 2,767 |  |  | $ | 470,534 |
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
March 31, 2017 |  |  |  |  |
Core deposit intangibles | $ | 47,992 |  |  | $ | (26,718 | ) |  | $ | 21,274 |
Customer relationship intangible | 1,970 |  |  | (733 | ) |  | 1,237 |
Total finite-lived intangible assets | $ | 49,962 |  |  | $ | (27,451 | ) |  | $ | 22,511 |
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 |
Schedule of 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
| March 31,
| 2017 |  | 2016
Amortization expense for: |  |  |
Core deposit intangibles | $ | 1,530 |  |  | $ | 1,664 |
Customer relationship intangible | 33 |  |  | 33 |
Total intangible amortization | $ | 1,563 |  |  | $ | 1,697 |
Schedule of 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 | $ | 5,723 |  |  | $ | 131 |  |  | $ | 5,854 |
2018 | 4,881 |  |  | 131 |  |  | 5,012 |
2019 | 4,101 |  |  | 131 |  |  | 4,232 |
2020 | 3,213 |  |  | 131 |  |  | 3,344 |
2021 | 2,273 |  |  | 131 |  |  | 2,404 |

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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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