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GOODWILL AND OTHER INTANGIBLES (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Gross Amount and Accumulated Amortization of Other Intangible Assets |
| The following table shows the gross amount and accumulated amortization of the Corporation’s intangible assets recognized as part of Other Assets in the consolidated statements of financial condition:
|  | As of |  | As of
|  | September 30, |  | December 31,
|  | 2018 |  | 2017
(Dollars in thousands) |  |  |  |  |
Core deposit intangible: |  |  |  |  |
Gross amount | $ | 51,664 |  | $ | 51,664
Accumulated amortization (1) |  | (47,079) |  |  | (46,186)
Net carrying amount | $ | 4,585 |  | $ | 5,478
Remaining amortization period |  | 6.3 years |  |  | 7.0 years
Purchased credit card relationship intangible: |  |  |  |  |
Gross amount | $ | 24,465 |  | $ | 24,465
Accumulated amortization (2) |  | (18,189) |  |  | (16,465)
Net carrying amount | $ | 6,276 |  | $ | 8,000
Remaining amortization period |  | 3.1 years |  |  | 3.9 years
Insurance customer relationship intangible: |  |  |  |  |
Gross amount | $ | 1,067 |  | $ | 1,067
Accumulated amortization (3) |  | (406) |  |  | (292)
Net carrying amount | $ | 661 |  | $ | 775
Remaining amortization period |  | 4.3 years |  |  | 5.0 years
(1) | For the quarter and nine-month period ended September 30, 2018, the amortization expense of core deposit intangibles amounted to $0.3 million and $0.9 million, respectively (2017 - $0.4 million and $1.3 million, respectively).
(2) | For the quarter and nine-month period ended September 30, 2018, the amortization expense of the purchased credit card relationship intangible amounted to $0.6 million and $1.7 million, respectively (2017 - $0.6 million and $1.9 million, respectively).
(3) | For the quarter and nine-month period ended September 30, 2018, the amortization expense of the insurance customer relationship intangible amounted to $38 thousand and $0.1 million, respectively (2017 - $38 thousand and $0.1 million, respectively).
The estimated aggregate annual amortization expense related to the intangible assets for future periods is as follows:
|  |  | Amount |
|  |  | (In thousands) |
| 2018 | $ | 860 |
| 2019 |  | 3,088 |
| 2020 |  | 2,851 |
| 2021 |  | 2,658 |
| 2022 |  | 915 |
| 2023 and after |  | 1,150 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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