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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2019
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:
| 2019 |  | 2018
| (Dollars in thousands)
Balances not subject to amortization |  |  |
Goodwill | $ | 506,206 |  |  | $ | 256,105 |
Balances subject to amortization |  |  |
Core deposit intangibles | 28,016 |  |  | 13,692 |
Other intangible assets | 1,270 |  |  | 1,558 |
Total other intangible assets | 29,286 |  |  | 15,250 |
Total goodwill and other intangible assets | $ | 535,492 |  |  | $ | 271,355 |
The changes in the carrying value of goodwill for the periods indicated were as follows:
| 2019 |  | 2018
| (Dollars in thousands)
Balance at beginning of year | $ | 256,105 |  |  | $ | 231,806 |
Acquisitions | 250,101 |  |  | 24,299 |
Balance at end of year | $ | 506,206 |  |  | $ | 256,105 |
The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated:
| December 31
| 2019 |  | 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (Dollars in thousands)
Core deposit intangibles | $ | 45,245 |  |  | $ | (17,229 | ) |  | $ | 28,016 |  |  | $ | 34,137 |  |  | $ | (20,445 | ) |  | $ | 13,692 |
Other intangible assets | 3,338 |  |  | (2,068 | ) |  | 1,270 |  |  | 3,103 |  |  | (1,545 | ) |  | 1,558 |
Total | $ | 48,583 |  |  | $ | (19,297 | ) |  | $ | 29,286 |  |  | $ | 37,240 |  |  | $ | (21,990 | ) |  | $ | 15,250 |
Amortization of intangible assets was $6.8 million, $2.7 million, and $3.5 million at December 31, 2019, 2018, and 2017, 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)
2020 | $ | 6,179 |
2021 | $ | 5,315 |
2022 | $ | 4,539 |
2023 | $ | 3,948 |
2024 | $ | 3,162 |
The original weighted average amortization period for intangible assets is 9.8 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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