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Goodwill and Intangible Assets - Schedule of Mortgage Servicing Rights (MSRs) and Related Valuation Allowance (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Loan Servicing Rights: |  |  |  |
Balance at Beginning of Period | $ 2,745 | $ 1,717 | $ 2,246 | $ 1,562
Additions | 164 | 381 | 562 | 924
Amortized to expense | (144) | (135) | (436) | (361)
Change in valuation allowance | (189) | 25 | 204 | (137)
Balance at End of Period | 2,576 | 1,988 | 2,576 | 1,988
Valuation allowance: |  |  |  |
Balance at Beginning of Period | (189) | 264 | 204 | 102
Additions expensed | $ 189 |  | 261 | 162
Reductions credited to operations |  | (25) | $ (465) | (25)
Balance at End of Period |  | $ 239 |  | $ 239

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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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