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Goodwill, Core Deposit Intangible and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Changes in Goodwill and Core Deposit Intangible Assets | The following table summarizes the changes in the Company’s goodwill and core deposit intangible assets for the years ended December 31, 2019, 2018, and 2017:
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | Goodwill |  |  | Core Deposit Intangible |  |  | Customer Relationship Intangible |  |  | Goodwill |  |  | Core Deposit Intangible |  |  | Customer Relationship Intangible |  |  | Goodwill |  |  | Core Deposit Intangible |  |  | Customer Relationship Intangible |
Beginning balance |  | $ | 128,177 |  |  | $ | 30,360 |  |  | $ | 3,059 |  |  | $ | 54,562 |  |  | $ | 16,720 |  |  | $ | — |  |  | $ | 51,975 |  |  | $ | 19,776 |  |  | $ | — |
Additions |  |  | 20,176 |  |  |  | 6,220 |  |  |  | — |  |  |  | 73,615 |  |  |  | 19,060 |  |  |  | 3,216 |  |  |  | 2,587 |  |  |  | — |  |  |  | — |
Amortization or accretion |  |  | — |  |  |  | (7,469 | ) |  |  | (268 | ) |  |  | — |  |  |  | (5,420 | ) |  |  | (157 | ) |  |  | — |  |  |  | (3,056 | ) |  |  | — |
Ending balance |  | $ | 148,353 |  |  | $ | 29,111 |  |  | $ | 2,791 |  |  | $ | 128,177 |  |  | $ | 30,360 |  |  | $ | 3,059 |  |  | $ | 54,562 |  |  | $ | 16,720 |  |  | $ | — |
Accumulated amortization or accretion |  | N/A |  |  | $ | 26,355 |  |  | $ | 425 |  |  | N/A |  |  | $ | 18,886 |  |  | $ | 157 |  |  | N/A |  |  | $ | 13,466 |  |  | N/A |
Weighted average remaining amortization or accretion period |  | N/A |  |  | 6.5 Years |  |  | 10.4 Years |  |  | N/A |  |  | 6.8 Years |  |  | 11.4 Years |  |  | N/A |  |  | 5.6 Years |  |  | N/A |
Estimated Amortization Expense for Core Deposit Intangible and Other Intangible Assets Recognized | The following table presents the estimated amortization expense for core deposit intangible and other intangible assets recognized at December 31, 2019:
|  | Estimated Amortization |
2020 |  | $ | 7,577 |
2021 |  |  | 7,012 |
2022 |  |  | 6,440 |
2023 |  |  | 4,336 |
2024 |  |  | 2,286 |
Thereafter |  |  | 4,251 |
Total |  | $ | 31,902 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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