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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill [Line Items] |
Changes in Goodwill | The following table presents the changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017:
(Dollars in thousands) | 2018 |  | 2017
Balance at January 1 | $ | 150,601 |  |  | $ | 150,601 |
Acquired in the HomeBancorp acquisition | 57,616 |  |  | — |
Acquired in the Capital Commerce acquisition | 10,680 |  |  | — |
Acquired in the Palmetto Heritage acquisition | 17,450 |  |  | — |
Balance at December 31 | $ | 236,347 |  |  | $ | 150,601 |
Mortgage Servicing Rights Key Economic Assumptions Used to Value | Key economic assumptions used to value mortgage servicing rights as of December 31, 2018 and 2017, were as follows:
| 2018 |  | 2017
Discount rate - conventional fixed loans | 9.69 | % |  | 9.41 | %
Discount rate - all loans excluding conventional fixed loans | 10.69 | % |  | 10.41 | %
Weighted average constant prepayment rate | 9.26 | % |  | 10.93 | %
Weighted average cost to service a loan | $ | 72.65 |  |  | $ | 64.03 |
Schedule of Mortgage Servicing Rights at Amortized Cost | The activity of the servicing asset for the years ended December 31, 2018, 2017 and 2016 is presented in the following table:
(Dollars in thousands) | 2018 |  | 2017 |  | 2016
Balance at January 1 | $ | 21,945 |  |  | $ | 20,415 |  |  | $ | 19,351 |
Servicing rights originated | 5,258 |  |  | 7,174 |  |  | 5,931 |
Amortization | (5,807 | ) |  | (5,648 | ) |  | (4,958 | )
Valuation allowance reversal | — |  |  | 4 |  |  | 91 |
Balance at December 31 | $ | 21,396 |  |  | $ | 21,945 |  |  | $ | 20,415 |
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets [Table Text Block] |
Schedule of Other Intangible Assets | The following information relates to other intangible assets, all customer-related, which are being amortized over their estimated useful lives:
(Dollars in thousands) | 2018 |  | 2017
Balance at January 1 | $ | 51,151 |  |  | $ | 57,625 |
Acquired in the Harvest Community Bank acquisition | — |  |  | 850 |
Acquired in the Guaranty acquisition | — |  |  | 9,870 |
Acquired in the HomeBancorp acquisition | 9,860 |  |  | — |
Acquired in the Capital Commerce acquisition | 2,680 |  |  | — |
Acquired in the Palmetto Heritage acquisition | 1,706 |  |  | — |
Amortization | (17,165 | ) |  | (17,194 | )
Balance at December 31 | $ | 48,232 |  |  | $ | 51,151 |
The gross amount of other intangible assets and accumulated amortization as of December 31, 2018 and 2017, are:
(Dollars in thousands) | 2018 |  | 2017
Gross balance | $ | 143,007 |  |  | $ | 128,761 |
Accumulated amortization | (94,775 | ) |  | (77,610 | )
Carrying value | $ | 48,232 |  |  | $ | 51,151 |
Future Amortization Expense Schedule | Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for core deposit intangibles in subsequent periods will be:
(Dollars in thousands) |
2019 | $ | 14,964 |
2020 | 11,729 |
2021 | 8,706 |
2022 | 5,805 |
2023 and subsequent | 7,028 |

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