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Note 14 - Deferred Compensation Plans (Details Textual) | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Officer [Member] |  |  |
Deferred Compensation Liability, Current and Noncurrent, Total | $ 219,000 | $ 259,000 |
Deferred Compensation Arrangement with Individual, Compensation Expense | 12,000 | $ 15,000 | $ 17,000
Director [Member] |  |  |
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year) |  | 15 years |
Deferred Compensation Liability, Current and Noncurrent, Total | 142,000 | $ 148,000 |
Deferred Compensation Arrangement with Individual, Compensation Expense | $ 17,000 | $ 17,000 | $ 18,000
Peoples Bancorp, Inc [Member] |  |  |
Number of Key Employees | 3 |  |
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year) | 10 years |  |

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- Definition Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 + Details
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