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Business Combination - Merger related costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Combination |  |  |  |  |  |
Merger related costs | $ 0 | $ 0 | $ 0 | $ 898 | $ 2,100 | $ 2,100
Merger related costs, after income taxes |  |  |  |  | $ 1,780 | $ 1,780
Peoples Bankshares, Incorporated (Peoples) |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Merger related costs |  | $ 0 |  | 1,400 |  |
Merger related costs, after income taxes |  |  |  | $ 1,130 |  |

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- Definition This element represents acquisition-related costs, after income taxes, incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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