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Core Deposit Intangible (Notes) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Core Deposit Intangible | The following table presents the changes in the carrying amount of core deposit intangible, gross carrying amount, accumulated amortization, and net book value:
| December 31,
| 2018 |  | 2017
Balance at the beginning of the year | $ | 782 |  |  | $ | 1,305 |
Amortization | (496 | ) |  | (523 | )
Additions | — |  |  | — |
Net Carrying Value | $ | 286 |  |  | $ | 782 |
Gross carrying amount | $ | 5,932 |  |  | $ | 5,932 |
Accumulated amortization | (5,646 | ) |  | (5,150 | )
Net Carrying Value | $ | 286 |  |  | $ | 782 |
Aggregate amortization expense was $496,000, $523,000 and $550,000 for 2018, 2017 and 2016, respectively. Estimated amortization expense for each of the next five years is as follows:
2019 | $ | 184 |
2020 | 61 |
2021 | 34 |
2022 | 7 |
2023 | — |

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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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