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Mortgage Servicing Rights (Tables) | 9 Months Ended
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Sep. 30, 2018
Mortgage Servicing Rights [Abstract] |
Mortgage servicing rights | The activity of the servicing asset for the three and nine months ended September 30, 2018 and 2017 is presented in the following table:
| Three months ended September 30 |  | Nine months ended September 30
(Dollars in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Beginning balance | $ | 21,657 |  |  | $ | 20,524 |  |  | $ | 21,945 |  |  | $ | 20,415 |
Servicing rights originated | 1,396 |  |  | 2,896 |  |  | 4,026 |  |  | 5,721 |
Amortization | (1,420 | ) |  | (1,417 | ) |  | (4,338 | ) |  | (4,137 | )
Valuation allowance reversal | — |  |  | — |  |  | — |  |  | 4 |
Ending balance | $ | 21,633 |  |  | $ | 22,003 |  |  | $ | 21,633 |  |  | $ | 22,003 |
Mortgage servicing rights economic assumptions | Valuation of mortgage servicing rights is performed using a pooling methodology. Similar loans are pooled together and evaluated on a discounted earnings basis to determine the present value of future earnings. Key economic assumptions used to value mortgage servicing rights as of September 30, 2018 and December 31, 2017 were as follows:
| September 30, 2018 |  | December 31, 2017
Discount rate - conventional fixed loans | 10.06 | % |  | 9.41 | %
Discount rate - all loans excluding conventional fixed loans | 11.06 | % |  | 10.41 | %
Weighted average constant prepayment rate | 8.38 | % |  | 10.93 | %
Weighted average cost to service a loan | $ | 72.67 |  |  | $ | 64.03 |

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- Definition Mortgage Servicing Rights [Abstract] + References No definition available. + Details
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- Definition Servicing Asset Key Economic Assumptions [Table Text Block] + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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