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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets |
| 9. | GOODWILL AND OTHER INTANGIBLE ASSETS
The following table presents the changes in the carrying amount of goodwill for the periods presented.
|  | As of and for the Year Ended December 31, |
|  | 2018 |  |  | 2017 |
|  | (Dollars in thousands) |
Balance, beginning of period |  | $ | 116,564 |  |  | $ | 89,533 |
Additions due to acquisitions |  |  | 549,975 |  |  |  | 27,031 |
Balance, end of period |  | $ | 666,539 |  |  | $ | 116,564 |
The following summarizes activity of amortizable core deposit intangible (“CDI”) assets for the periods presented.
|  | As of and For the Year Ended December 31, |
|  | 2018 |  |  | 2017 |
|  | Gross CDI Amount |  |  | Accumulated Amortization |  |  | Net CDI Amount |  |  | Gross CDI Amount |  |  | Accumulated Amortization |  |  | Net CDI Amount |
|  | (Dollars in thousands) |
Balance of intangible assets, beginning of period |  | $ | 41,097 |  |  | $ | (34,259 | ) |  | $ | 6,838 |  |  | $ | 37,940 |  |  | $ | (32,930 | ) |  | $ | 5,010 |
Additions due to acquisitions |  |  | 52,200 |  |  |  |  |  |  |  |  |  |  |  | 3,157 |  |  |  |  |  |  |  |  |
Balance of intangible assets, end of period |  | $ | 93,297 |  |  | $ | (39,513 | ) |  | $ | 53,784 |  |  | $ | 41,097 |  |  | $ | (34,259 | ) |  | $ | 6,838 |
Aggregate amortization expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For year ended December 31, |  | $ | 5,254 |  |  |  |  |  |  |  |  |  |  | $ | 1,329 |  |  |  |  |  |  |  |  |
Estimated Amortization Expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ending December 31, 2019 |  |  | 10,798 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ending December 31, 2020 |  |  | 9,352 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ending December 31, 2021 |  |  | 8,240 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
For the year ending December 31, 2022 |  |  | 7,126 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  |  | 18,268 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2018 the weighted average remaining life of intangible assets is approximately 3.21 years.

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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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