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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2017 |
|  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying amount |
Core deposit intangible assets |  | $ | 2,067 |  |  | $ | (1,324 | ) |  | $ | 743 |
Lease intangible asset |  |  | 350 |  |  |  | (177 | ) |  |  | 173 |
Mortgage servicing rights |  |  | 6,169 |  |  |  | (3,343 | ) |  |  | 2,826 |
Total other intangible assets |  | $ | 8,586 |  |  | $ | (4,844 | ) |  | $ | 3,742 |
(Dollars in thousands) |  | As of December 31, 2016 |
|  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net carrying amount |
Core deposit intangible assets |  | $2,067 |  |  | $(1,137) |  |  | $930 |
Lease intangible asset |  |  | 350 |  |  |  | (143 | ) |  |  | 207 |
Mortgage servicing rights |  |  | 5,788 |  |  |  | (2,939 | ) |  |  | 2,849 |
Total other intangible assets |  | $ | 8,205 |  |  | $ | (4,219 | ) |  | $ | 3,986 |
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 2017 and in successive years ending December 31:
|  | Amortization |
(Dollars in thousands) |  | expense |
Remainder of 2017 |  | $ | 68 |
2018 |  |  | 252 |
2019 |  |  | 214 |
2020 |  |  | 177 |
2021 |  |  | 121 |
Thereafter |  |  | 84 |
Total |  | $ | 916 |
Schedule of Participating Mortgage Loans | The following table provides information on the principal balances of mortgage loans serviced for others:
|  | September 30, |  |  | December 31, |
(Dollars in thousands) |  | 2017 |  |  | 2016 |
FHLMC |  | $ | 511,517 |  |  | $ | 483,356 |
FHLB |  |  | 10,002 |  |  |  | 11,393 |
Total |  | $ | 521,519 |  |  | $ | 494,749 |
Schedule of Servicing Asset at Amortized Cost | Activity for mortgage servicing rights and the related valuation allowance follows:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
(Dollars in thousands) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Mortgage servicing rights: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 2,813 |  |  | $ | 2,851 |  |  | $ | 2,849 |  |  | $ | 2,840 |
Additions |  |  | 260 |  |  |  | 268 |  |  |  | 702 |  |  |  | 780 |
Amortization |  |  | (247 | ) |  |  | (291 | ) |  |  | (725 | ) |  |  | (792 | )
Balance at end of period |  | $ | 2,826 |  |  | $ | 2,828 |  |  | $ | 2,826 |  |  | $ | 2,828 |

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