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Loan Servicing Rights (Tables) | 12 Months Ended
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Dec. 31, 2020
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Components of Loan Servicing Rights and Valuation Allowance | The following table summarizes the carrying values and activity related to loan servicing rights and the related valuation allowance:
| Years Ended December 31,
(dollars in thousands) | 2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | 25,399 |  |  | $ | 24,512 |  |  | $ | 24,690 |
Additions (1) | 12,810 |  |  | 6,499 |  |  | 4,264 |
Amortization | (10,085) |  |  | (5,612) |  |  | (4,442) |
Balance before valuation allowance at end of period | 28,124 |  |  | 25,399 |  |  | 24,512 |
Valuation allowance: |  |  |  |  |
Balance at beginning of period | (31) |  |  | (15) |  |  | (29) |
(Additions)/recoveries | (1,376) |  |  | (16) |  |  | 14 |
Balance at end of period | (1,407) |  |  | (31) |  |  | (15) |
Loan servicing rights, net | $ | 26,717 |  |  | $ | 25,368 |  |  | $ | 24,497 |
(1) Additions in 2018 include loan servicing rights of $0.3 million acquired from Klein in November 2018.

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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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