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GOODWILL AND OTHER INTANGIBLES (Tables)
9 Months Ended
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 ofAs 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 period6.3 years7.0 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 period3.1 years3.9 years
Insurance customer relationship intangible:
Gross amount$1,067$1,067
Accumulated amortization (3)(406)(292)
Net carrying amount$661$775
Remaining amortization period4.3 years5.0 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
20193,088
20202,851
20212,658
2022915
2023 and after1,150