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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] |
Schedule of Goodwill | Goodwill. Year-end goodwill was as follows:
| 2017 |  | 2016
Goodwill | $ | 654,952 |  |  | $ | 654,952 |
Schedule of Other Intangible Assets | Other Intangible Assets. Year-end other intangible assets were as follows:
| Gross Intangible Assets |  | Accumulated Amortization |  | Net Intangible Assets
2017 |  |  |  |  |
Core deposits | $ | 9,300 |  |  | $ | (5,256 | ) |  | $ | 4,044 |
Customer relationships | 4,669 |  |  | (3,683 | ) |  | 986 |
Non-compete agreements | 74 |  |  | (31 | ) |  | 43 |
| $ | 14,043 |  |  | $ | (8,970 | ) |  | $ | 5,073 |
2016 |  |  |  |  |
Core deposits | $ | 9,300 |  |  | $ | (4,002 | ) |  | $ | 5,298 |
Customer relationships | 6,102 |  |  | (4,692 | ) |  | 1,410 |
Non-compete agreements | 74 |  |  | (6 | ) |  | 68 |
| $ | 15,476 |  |  | $ | (8,700 | ) |  | $ | 6,776 |
Estimated Aggregate Future Amortization Expense for Intangible Assets | The estimated aggregate future amortization expense for intangible assets remaining as of December 31, 2017 is as follows:
2018 | $ | 1,424 |
2019 | 1,167 |
2020 | 918 |
2021 | 697 |
2022 | 481 |
Thereafter | 386 |
| $ | 5,073 |

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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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