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Mortgage Servicing Rights (Tables) | 9 Months Ended
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Sep. 30, 2021
Mortgage Servicing Rights [Abstract] |
Mortgage servicing rights | The following table presents changes in the servicing asset during the three and nine months ended September 30, 2021 and 2020:
| Three months ended September 30 |  | Nine months ended September 30
(Dollars in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Beginning balance | $ | 21,985 |  |  | $ | 18,664 |  |  | $ | 18,426 |  |  | $ | 22,963 |
Servicing rights originated | 1,891 |  |  | 1,994 |  |  | 8,436 |  |  | 5,673 |
Amortization | (2,180) |  |  | (2,208) |  |  | (6,505) |  |  | (6,150) |
Valuation allowance (increase) decrease | — |  |  | (305) |  |  | 1,339 |  |  | (4,341) |
Ending balance | $ | 21,696 |  |  | $ | 18,145 |  |  | $ | 21,696 |  |  | $ | 18,145 |
Schedule of Activity in Servicing Asset Valuation Allowance | The following table presents the activity in the servicing asset valuation allowance for the three and nine months ended September 30, 2021 and 2020:
| Three months ended September 30 |  | Nine months ended September 30
(Dollars in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Beginning balance | $ | 3,026 |  |  | $ | 4,258 |  |  | $ | 4,365 |  |  | $ | 222 |
Valuation allowance increase (decrease) | — |  |  | 305 |  |  | (1,339) |  |  | 4,341 |
Ending balance | $ | 3,026 |  |  | $ | 4,563 |  |  | $ | 3,026 |  |  | $ | 4,563 |
Mortgage servicing rights economic assumptions | Mortgage servicing rights valuations are performed using a pooling methodology where loans with similar risk characteristics are grouped together and evaluated using discounted cash flows to estimate the present value of future earnings. Key economic assumptions used to value mortgage servicing rights were as follows:
| September 30, 2021 |  | December 31, 2020
Discount rate - conventional fixed loans | 8.49 | % |  | 7.92 | %
Discount rate - all loans excluding conventional fixed loans | 9.49 | % |  | 8.92 | %
Weighted average constant prepayment rate | 17.32 | % |  | 20.62 | %
Weighted average cost to service a loan | $ | 87.58 |  |  | $ | 87.58 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 + Details
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- Definition Tabular disclosure of the activity by class in any valuation allowance for impairment of recognized servicing assets - including beginning and ending balances, aggregate additions charged and recoveries credited to operations, and aggregate write-downs charged against allowance. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 + Details
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