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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill [Line Items] |
Changes in Goodwill | The following table presents the changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016:
(Dollars in thousands) | 2017 |  | 2016
Balance at January 1 | $ | 150,601 |  |  | $ | 139,773 |
Acquired in the Cordia merger | — |  |  | 10,828 |
Balance at December 31 | $ | 150,601 |  |  | $ | 150,601 |
Mortgage Servicing Rights Key Economic Assumptions Used to Value | Key economic assumptions used to value mortgage servicing rights as of December 31, 2017 and 2016 were as follows:
| 2017 |  | 2016
Discount rate - conventional fixed loans | 9.41 | % |  | 9.45 | %
Discount rate - all loans excluding conventional fixed loans | 10.41 | % |  | 10.45 | %
Weighted average constant prepayment rate | 10.93 | % |  | 10.42 | %
Weighted average cost to service a loan | $ | 64.03 |  |  | $ | 62.75 |
Schedule of Mortgage Servicing Rights at Amortized Cost | The activity of the servicing asset for the years ended December 31, 2017, 2016 and 2015 is presented in the following table:
(Dollars in thousands) | 2017 |  | 2016 |  | 2015
Balance at January 1 | $ | 20,415 |  |  | $ | 19,351 |  |  | $ | 16,688 |
Servicing rights originated | 7,174 |  |  | 5,931 |  |  | 5,910 |
Amortization | (5,648 | ) |  | (4,958 | ) |  | (4,002 | )
Valuation allowance reversal | 4 |  |  | 91 |  |  | 755 |
Balance at December 31 | $ | 21,945 |  |  | $ | 20,415 |  |  | $ | 19,351 |
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets [Table Text Block] | The following table presents the activity in the servicing asset valuation allowance for the years ended December 31, 2017, 2016 and 2015:
(Dollars in thousands) | 2017 |  | 2016 |  | 2015
Balance at January 1 | $ | 4 |  |  | $ | 95 |  |  | $ | 850 |
Valuation allowance reversal | (4 | ) |  | (91 | ) |  | (755 | )
Balance at December 31 | $ | — |  |  | $ | 4 |  |  | $ | 95 |
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) | 2017 |  | 2016
Balance at January 1 | $ | 57,625 |  |  | $ | 71,635 |
Acquired in the NMSB acquisition | — |  |  | 240 |
Acquired in the FCSB acquisition | — |  |  | 390 |
Acquired in the Cordia acquisition | — |  |  | 2,210 |
Acquired in the HCB acquisition | 850 |  |  | — |
Acquired in the Guaranty acquisition | 9,870 |  |  | — |
Amortization | (17,194 | ) |  | (16,850 | )
Balance at December 31 | $ | 51,151 |  |  | $ | 57,625 |
The gross amount of other intangible assets and accumulated amortization as of December 31, 2017 and 2016, are:
(Dollars in thousands) | 2017 |  | 2016
Gross balance | $ | 128,761 |  |  | $ | 118,041 |
Accumulated amortization | (77,610 | ) |  | (60,416 | )
Carrying value | $ | 51,151 |  |  | $ | 57,625 |
Future Amortization Expense Schedule | Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for intangible assets in subsequent periods will be:
(Dollars in thousands) |
2018 | $ | 15,394 |
2019 | 12,275 |
2020 | 9,431 |
2021 | 6,799 |
2022 | 4,288 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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