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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 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:
|  | As of December 31, 2018 |
(Dollars in thousands) |  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying amount |
Core deposit intangible assets |  | $ | 2,067 |  |  | $ | (1,588 | ) |  | $ | 479 |
Lease intangible asset |  |  | 350 |  |  |  | (233 | ) |  |  | 117 |
Mortgage servicing rights |  |  | 6,545 |  |  |  | (4,050 | ) |  |  | 2,495 |
Total other intangible assets |  | $ | 8,962 |  |  | $ | (5,871 | ) |  | $ | 3,091 |
|  | 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 years ending December 31:
|  |  | Amortization |
(Dollars in thousands) |  |  | expense |
2019 |  |  |  | 214 |
2020 |  |  |  | 177 |
2021 |  |  |  | 121 |
2022 |  |  |  | 58 |
2023 |  |  |  | 26 |
Total |  |  | $ | 596 |
Schedule of Participating Mortgage Loans | The following table provides information on the principal balances of mortgage loans serviced for others:
|  | As of December 31, |
(Dollars in thousands) |  | 2018 |  |  | 2017 |
FHLMC |  | $ | 521,489 |  |  | $ | 517,863 |
FHLB |  |  | 10,603 |  |  |  | 9,782 |
Schedule of Servicing Asset at Amortized Cost | Activity for mortgage servicing rights and the related valuation allowance follows:
|  | As of December 31, |
(Dollars in thousands) |  | 2018 |  |  | 2017 |
Mortgage servicing rights: |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 2,811 |  |  | $ | 2,849 |
Additions |  |  | 543 |  |  |  | 931 |
Amortization |  |  | (859 | ) |  |  | (969 | )
Balance at end of year |  | $ | 2,495 |  |  | $ | 2,811 |

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