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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Goodwill. Year-end goodwill was as follows:
| 2019 |  | 2018
Goodwill | $ | 654,952 |  |  | $ | 654,952 |
Other Intangible Assets. Year-end other intangible assets were as follows:
| Gross Intangible Assets |  | Accumulated Amortization |  | Net Intangible Assets
2019 |  |  |  |  |
Core deposits | $ | 9,300 |  |  | $ | (7,257 | ) |  | $ | 2,043 |
Customer relationships | 3,388 |  |  | (2,950 | ) |  | 438 |
| $ | 12,688 |  |  | $ | (10,207 | ) |  | $ | 2,481 |
2018 |  |  |  |  |
Core deposits | $ | 9,300 |  |  | $ | (6,341 | ) |  | $ | 2,959 |
Customer relationships | 4,206 |  |  | (3,534 | ) |  | 672 |
Non-compete agreements | 74 |  |  | (56 | ) |  | 18 |
| $ | 13,580 |  |  | $ | (9,931 | ) |  | $ | 3,649 |
Other intangible assets are amortized on an accelerated basis over their estimated lives, which range from 5 to 10 years. Amortization expense related to intangible assets totaled $1.2 million in 2019, $1.4 million in 2018, and $1.7 million in 2017. The estimated aggregate future amortization expense for intangible assets remaining as of December 31, 2019 is as follows:
2020 | $ | 918 |
2021 | 697 |
2022 | 481 |
2023 | 282 |
2024 | 87 |
Thereafter | 16 |
| $ | 2,481 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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