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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill | A summary of the other intangible assets that continue to be subject to amortization is as follows:
(Dollars in thousands) |  | As of September 30, 2018 |
|  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying amount |
Core deposit intangible assets |  | $ | 2,067 |  |  | $ | (1,540 | ) |  | $ | 527 |
Lease intangible asset |  |  | 350 |  |  |  | (222 | ) |  |  | 128 |
Mortgage servicing rights |  |  | 6,489 |  |  |  | (3,914 | ) |  |  | 2,575 |
Total other intangible assets |  | $ | 8,906 |  |  | $ | (5,676 | ) |  | $ | 3,230 |
(Dollars in thousands) |  | As of December 31, 2017 |
|  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying amount |
Core deposit intangible assets |  | $ | 2,067 |  |  | $ | (1,381 | ) |  | $ | 686 |
Lease intangible asset |  |  | 350 |  |  |  | (188 | ) |  |  | 162 |
Mortgage servicing rights |  |  | 6,285 |  |  |  | (3,474 | ) |  |  | 2,811 |
Total other intangible assets |  | $ | 8,702 |  |  | $ | (5,043 | ) |  | $ | 3,659 |
Schedule of Finite-lived Intangible Assets, Future Amortization Expense | The following sets forth estimated amortization expense for core deposit and lease intangible assets for the remainder of 2018 and in successive years ending December 31:
(Dollars in thousands) |  | Amortization |
|  | expense |
Remainder of 2018 |  | $ | 59 |
2019 |  |  | 214 |
2020 |  |  | 177 |
2021 |  |  | 121 |
2022 |  |  | 58 |
Thereafter |  |  | 26 |
Total |  | $ | 655 |
Schedule of Participating Mortgage Loans | Mortgage loans serviced for others are not reported as assets. The following table provides information on the principal balances of mortgage loans serviced for others:
(Dollars in thousands) |  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
FHLMC |  | $ | 523,161 |  |  | $ | 517,863 |
FHLB |  |  | 8,959 |  |  |  | 9,782 |
Total |  | $ | 532,120 |  |  | $ | 527,645 |
Schedule of Servicing Asset at Amortized Cost | Activity for mortgage servicing rights and the related valuation allowance was as follows:
(Dollars in thousands) |  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Mortgage servicing rights: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 2,639 |  |  | $ | 2,813 |  |  | $ | 2,811 |  |  | $ | 2,849 |
Additions |  |  | 150 |  |  |  | 260 |  |  |  | 409 |  |  |  | 702 |
Amortization |  |  | (214 | ) |  |  | (247 | ) |  |  | (645 | ) |  |  | (725 | )
Balance at end of period |  | $ | 2,575 |  |  | $ | 2,826 |  |  | $ | 2,575 |  |  | $ | 2,826 |

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