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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Intangible Assets |
Schedule of changes in mortgage servicing rights (MSRs) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019 |  | 2018
Balance at beginning of period | ​ | $ | 2,482 | ​ | $ | 2,931 | ​ | $ | 2,713
Originated mortgage servicing rights | ​ |  | 866 | ​ |  | 290 | ​ |  | 245
Changes in fair value: | ​ |  |  | ​ |  |  | ​ |  |
Due to changes in model inputs and assumptions (1) | ​ |  | (422) | ​ |  | (434) | ​ |  | 286
Other changes in fair value (2) | ​ |  | (481) | ​ |  | (305) | ​ |  | (313)
Total changes in fair value | ​ | ​ | (903) | ​ | ​ | (739) | ​ | ​ | (27)
Balance at end of period | ​ | $ | 2,445 | ​ | $ | 2,482 | ​ | $ | 2,931
​
(1) | The change in fair value resulting from changes in valuation inputs or assumptions used in the valuation model reflects the change in discount rates and prepayment speed assumptions primarily due to changes in interest rates.
(2) | Other changes in fair value reflect changes due to customer payments and passage of time.
Schedule of key data and assumptions used in estimating the fair value of the Company's MSRs | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |
Weighted average constant prepayment rate | ​ | 15.74 | % | 13.42 | %
Weighted average note rate | ​ | 3.55 | % | 3.93 | %
Weighted average discount rate | ​ | 7.75 | % | 8.61 | %
Weighted average expected life (in years) | ​ | 4.8 |  | 4.8 | ​

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- Definition Tabular disclosure of all information related to the key inputs and assumptions used in measuring the fair value of assets obtained or liabilities incurred, as the result of a sale of financial assets, relating to the transferor's continuing involvement, if any, at the time of securitization, asset-backed financing arrangement, or similar transfer (including at a minimum, but not limited to, and if applicable, quantitative information about discount rates, expected prepayments including the expected weighted-average life of prepayable financial assets, and anticipated credit losses, including expected static pool losses). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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- Definition Tabular disclosure of the activity in the balance of servicing assets (including a description of where changes in fair value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (for instance, through purchases of servicing assets), disposals, changes in fair value during the period resulting from changes in inputs or assumptions used in the valuation model, other changes in fair value along with a description of those changes, and other changes that affect the balance along with a description of those changes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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