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OTHER INTANGIBLE ASSETS | 9 Months Ended
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Sep. 30, 2017
OTHER INTANGIBLE ASSETS |
OTHER INTANGIBLE ASSETS | 8. CORE DEPOSIT PREMIUM AND MORTGAGE SERVICING RIGHTS The following table presents changes in core deposit premium and mortgage servicing rights for the nine months ended September 30, 2017:
(dollars in thousands) | Core Deposit Premium |  | Mortgage Servicing Rights |  | Total
Balance, beginning of period | $ | 4,680 |  |  | $ | 15,779 |  |  | $ | 20,459 |
Additions | — |  |  | 1,857 |  |  | 1,857 |
Amortization | (2,006 | ) |  | (1,543 | ) |  | (3,549 | )
Balance, end of period | $ | 2,674 |  |  | $ | 16,093 |  |  | $ | 18,767 |
Income generated as the result of new mortgage servicing rights is reported as gains on sales of loans and totaled $0.6 million and $1.9 million for the three and nine months ended September 30, 2017, compared to $0.9 million and $2.1 million for the three and nine months ended September 30, 2016. Amortization of mortgage servicing rights was $0.5 million and $1.5 million for the three and nine months ended September 30, 2017, compared to $1.0 million and $4.3 million for the three and nine months ended September 30, 2016. The following table presents the fair market value and key assumptions used in determining the fair market value of our mortgage servicing rights:
(dollars in thousands) | September 30, 2017 |  | September 30, 2016
Fair market value, beginning of period | $ | 18,087 |  |  | $ | 18,345 |
Fair market value, end of period | 16,777 |  |  | 16,025 |
Weighted average discount rate | 9.5 | % |  | 9.5 | %
Forecasted constant prepayment rate assumption | 16.5 |  |  | 16.7 |
The gross carrying value and accumulated amortization related to our core deposit premium and mortgage servicing rights are presented below:
| September 30, 2017 |  | December 31, 2016
(dollars in thousands) | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Core deposit premium | $ | 44,642 |  |  | $ | (41,968 | ) |  | $ | 2,674 |  |  | $ | 44,642 |  |  | $ | (39,962 | ) |  | $ | 4,680 |
Mortgage servicing rights | 63,906 |  |  | (47,813 | ) |  | 16,093 |  |  | 62,049 |  |  | (46,270 | ) |  | 15,779 |
Total | $ | 108,548 |  |  | $ | (89,781 | ) |  | $ | 18,767 |  |  | $ | 106,691 |  |  | $ | (86,232 | ) |  | $ | 20,459 |
Based on the core deposit premium and mortgage servicing rights held as of September 30, 2017, estimated amortization expense for the remainder of fiscal year 2017, the next five succeeding fiscal years and all years thereafter are as follows:
| Estimated Amortization Expense
(dollars in thousands) | Core Deposit Premium |  | Mortgage Servicing Rights |  | Total
2017 (remainder) | $ | 668 |  |  | $ | 772 |  |  | $ | 1,440 |
2018 | 2,006 |  |  | 2,595 |  |  | 4,601 |
2019 | — |  |  | 2,047 |  |  | 2,047 |
2020 | — |  |  | 1,677 |  |  | 1,677 |
2021 | — |  |  | 1,393 |  |  | 1,393 |
2022 | — |  |  | 1,179 |  |  | 1,179 |
Thereafter | — |  |  | 6,430 |  |  | 6,430 |
| $ | 2,674 |  |  | $ | 16,093 |  |  | $ | 18,767 |
We perform an impairment assessment of our core deposit premium and mortgage servicing rights whenever events or changes in circumstance indicate that the carrying value of those assets may not be recoverable. Our impairment assessments involve, among other valuation methods, the estimation of future cash flows and other methods of determining fair value. Estimating future cash flows and determining fair values is subject to judgment and often involves the use of significant estimates and assumptions. The variability of the factors we use to perform our impairment tests depend on a number of conditions, including the uncertainty about future events and cash flows. All such factors are interdependent and, therefore, do not change in isolation. Accordingly, our accounting estimates may materially change from period to period due to changing market factors.

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