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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill [Line Items] |
Changes in Goodwill | The following table presents the changes in the carrying amount of goodwill.
(Dollars in thousands) | 2015 |  | 2014
Balance at January 1 | $ | 139,773 |  |  | $ | 102,625 |
Acquired in the 1st Financial merger | — |  |  | 32,915 |
Acquired in the Bancorporation merger | — |  |  | 4,233 |
Balance at December 31 | $ | 139,773 |  |  | $ | 139,773 |
Mortgage Servicing Rights Key Economic Assumptions Used to Value | Key economic assumptions used to value mortgage servicing rights as of December 31, 2015 and 2014 were as follows:
| 2015 |  | 2014
Discount rate - conventional fixed loans | 9.31 | % |  | 7.20 | %
Discount rate - all loans excluding conventional fixed loans | 10.31 | % |  | 9.20 | %
Weighted average constant prepayment rate | 11.01 | % |  | 14.25 | %
Weighted average cost to service a loan | $ | 56.61 |  |  | $ | 56.02 |
Schedule of Mortgage Servicing Rights at Amortized Cost | The activity of the servicing asset for the years ended December 31, 2015 and 2014 is presented in the following table:
(Dollars in thousands) | 2015 |  | 2014
Balance at January 1 | $ | 16,688 |  |  | $ | 16 |
Servicing rights originated | 5,910 |  |  | 727 |
Amortization | (4,002 | ) |  | (919 | )
Servicing rights acquired in the 1st Financial merger | — |  |  | 148 |
Servicing rights acquired in the Bancorporation merger | — |  |  | 17,566 |
Valuation allowance reversal (provision) | 755 |  |  | (850 | )
Balance at December 31 | $ | 19,351 |  |  | $ | 16,688 |
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, 2015 and 2014:
(Dollars in thousands) | 2015 |  | 2014
Balance at January 1 | $ | 850 |  |  | $ | — |
Valuation allowance (reversal) provision | (755 | ) |  | 850 |
Balance at December 31 | $ | 95 |  |  | $ | 850 |
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) | 2015 |  | 2014
Balance at January 1 | $ | 89,922 |  |  | $ | 1,247 |
Acquired in CCBT merger | 690 |  |  | — |
Acquired in the 1st Financial merger | — |  |  | 3,780 |
Acquired in the Bancorporation merger | — |  |  | 91,850 |
Removal due to branch sale | (85 | ) |  | — |
Amortization | (18,892 | ) |  | (6,955 | )
Balance at December 31 | $ | 71,635 |  |  | $ | 89,922 |
Core deposit intangibles comprise the majority of the other intangible assets as of December 31, 2015 and 2014. During 2015, BancShares recognized $690 thousand in core deposit intangibles related to the CCBT merger. Core deposit intangibles of $85 thousand were written off in 2015 as it related to previously acquired deposits that were sold in connection with the sale of a branch in December 2015. During 2014, BancShares recognized $91.9 million and $3.8 million in core deposit intangibles related to the Bancorporation and 1st Financial mergers, respectively. Intangible assets generated by acquisitions, which represent the estimated fair value of core deposits and other customer relationships that were acquired, are being amortized on an accelerated basis over their estimated useful lives. The estimated useful remaining lives range from 2 years to less than 9 years. The gross amount of other intangible assets and accumulated amortization as of December 31, 2015 and 2014, are:
(dollars in thousands) | 2015 |  | 2014
Gross balance | $ | 115,201 |  |  | $ | 114,596 |
Accumulated amortization | (43,566 | ) |  | (24,674 | )
Carrying value | $ | 71,635 |  |  | $ | 89,922 |
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) |
2016 | $ | 16,440 |
2017 | 14,075 |
2018 | 11,710 |
2019 | 9,457 |
2020 | 7,492 |

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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=26713463&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=26713463&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=56950315&loc=d3e122739-111746 + Details
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