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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