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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLE ASSETS The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31:
| 2018 |  | 2017
| (Dollars in thousands)
Balances not subject to amortization |  |  |
Goodwill | $ | 256,105 |  |  | $ | 231,806 |
Balances subject to amortization |  |  |
Core deposit intangibles | 13,692 |  |  | 8,636 |
Other intangible assets | 1,558 |  |  | 705 |
Total other intangible assets | 15,250 |  |  | 9,341 |
Total goodwill and other intangible assets | $ | 271,355 |  |  | $ | 241,147 |
The changes in the carrying value of goodwill for the periods indicated were as follows:
| 2018 |  | 2017
| (Dollars in thousands)
Balance at beginning of year | $ | 231,806 |  |  | $ | 221,526 |
Acquisitions | 24,299 |  |  | 10,280 |
Balance at end of year | $ | 256,105 |  |  | $ | 231,806 |
The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated:
| December 31
| 2018 |  | 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (Dollars in thousands)
Core deposit intangibles | $ | 34,137 |  |  | $ | (20,445 | ) |  | $ | 13,692 |  |  | $ | 26,736 |  |  | $ | (18,100 | ) |  | $ | 8,636 |
Other intangible assets | 3,103 |  |  | (1,545 | ) |  | 1,558 |  |  | 3,165 |  |  | (2,460 | ) |  | 705 |
Total | $ | 37,240 |  |  | $ | (21,990 | ) |  | $ | 15,250 |  |  | $ | 29,901 |  |  | $ | (20,560 | ) |  | $ | 9,341 |
Amortization of intangible assets was $2.7 million, $3.5 million , and $2.8 million at December 31, 2018, 2017, and 2016, respectively. The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years:
Year | Amount
| (Dollars in thousands)
2019 | $ | 3,050 |
2020 | $ | 2,647 |
2021 | $ | 2,394 |
2022 | $ | 1,962 |
2023 | $ | 1,697 |
The original weighted average amortization period for intangible assets is 10.0 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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