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Note 3 - Investment Securities (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jul. 31, 2024
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 418,935,000 | $ 468,549,000 |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Allowance for Credit Loss |  | 0 |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss |  | $ 7,000,000 | 7,000,000 |  | $ 2,000,000
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage |  | 7.80% |  |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage |  | 34.40% |  |  |
Debt Securities, Available-for-Sale, Realized Gain |  | $ 133,000 | 79,000 |  |
Debt Securities, Available-for-Sale, Realized Loss |  | 101,000 | 193,000 |  |
Proceeds from Sale of Debt Securities, Available-for-Sale |  | 19,189,000 | 20,641,000 | $ 0 |
Investment, Number of Shares Acquired | 90,000 |  |  |  |
Investment Ownership Percentage | 5.00% |  |  |  |
Payments to Acquire Other Investments | $ 1,900,000 |  |  |  |
Equity Securities, FV-NI, Unrealized Loss |  | 374,000 | 207,000 |  |
Equity Securities, FV-NI, Unrealized Gain |  |  |  | 414,000 |
Equity Securities, FV-NI, Current |  | 887,000,000,000 | 1,300,000 |  |
Peoples Bancorp, Inc [Member] | Class B Shares of VISA [Member] |  |  |  |  |
Equity Securities, FV-NI, Cost |  | 0 |  |  |
Equity Securities, FV-NI, Realized Gain (Loss) |  | 157,000 |  |  |
Limited Partnership Interest, Technology Fund [Member] |  |  |  |  |
Proceeds from Equity Method Investment, Distribution, Return of Capital |  | 35,000 |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount |  | 0 | 0 | $ 0 |
Other Assets [Member] | Limited Partnership Interest, Technology Fund [Member] |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  | 965,000 | 1,000,000 |  |
Other Liabilities [Member] | Limited Partnership Interest, Technology Fund [Member] |  |  |  |  |
Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount |  | 380,000 | $ 530,000 |  |
Collateral Pledged [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 92,400,000 |  |  |
Debt Securities, Available-for-Sale, Restricted |  | $ 89,000,000 |  |  |

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