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Other Intangibles | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangibles | OTHER INTANGIBLES Core deposit intangibles and other intangibles are recorded on the acquisition date of an entity. During the measurement period, the Corporation may record subsequent adjustments to these intangibles for provisional amounts recorded at the acquisition date. The IAB acquisition on July 14, 2017 resulted in a core deposit intangible of $13,638,000 and other intangibles, consisting of non-compete intangibles, of $3,765,000. The Arlington Bank acquisition on May 19, 2017 resulted in a core deposit intangible of $4,526,000. Details regarding the IAB and Arlington Bank acquisitions are discussed in NOTE 2. ACQUISITIONS of these in the Notes to Consolidated Financial Statements. The carrying basis and accumulated amortization of recognized core deposit and other intangibles are noted below.
| 2018 |  | 2017
Gross carrying amount | $ | 85,869 |  |  | $ | 63,940 |
Core deposit intangible acquired |  |  |  | 18,164 |
Other intangibles acquired |  |  |  | 3,765 |
Accumulated amortization | (61,440 | ) |  | (54,721 | )
Core Deposit and Other Intangibles | $ | 24,429 |  |  | $ | 31,148 |
Amortization expense for the years ended December 31, 2018, 2017 and 2016, was $6,719,000, $5,647,000 and $3,910,000, respectively. Estimated future amortization expense is summarized as follows:
| Amortization Expense
2019 | $ | 5,169 |
2020 | 3,632 |
2021 | 3,427 |
2022 | 3,325 |
2023 | 3,175 |
After 2023 | 5,701 |
| $ | 24,429 |

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- Definition The entire disclosure for all or part of the information related to 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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