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Mortgage Servicing Rights (Tables) | 3 Months Ended
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Mar. 31, 2019
Mortgage Servicing Rights [Abstract] |
Mortgage servicing rights | The following table explains changes in the servicing asset during the three months ended March 31, 2019 and 2018.
(Dollars in thousands) | Total
Balance at December 31, 2018 | $ | 21,396 |
Servicing rights originated | 859 |
Amortization | (1,447 | )
Valuation allowance provision | (161 | )
Balance at March 31, 2019 | $ | 20,647 |
Balance at December 31, 2017 | $ | 21,945 |
Servicing rights originated | 1,200 |
Amortization | (1,486 | )
Balance at March 31, 2018 | $ | 21,659 |
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 were as follows:
| March 31, 2019 |  | December 31, 2018
Discount rate - conventional fixed loans | 9.41 | % |  | 9.69 | %
Discount rate - all loans excluding conventional fixed loans | 10.41 | % |  | 10.69 | %
Weighted average constant prepayment rate | 11.28 | % |  | 9.26 | %
Weighted average cost to service a loan | $ | 88.07 |  |  | $ | 87.52 |

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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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