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Note 3 - Investment Securities (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Oct. 31, 2021
Debt Securities, Available-for-Sale, Amortized Cost   $ 468,549,000 $ 507,466,000    
Debt Securities, Available-for-Sale and Held-to-Maturity, Allowance for Credit Loss   $ 0      
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   7.70%      
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   36.50%      
Debt Securities, Available-for-Sale, Realized Gain   $ 79,000   $ 12,000  
Debt Securities, Available-for-Sale, Realized Loss   193,000   5,000  
Proceeds from Sale of Debt Securities, Available-for-Sale   20,641,000 0 1,798,000  
Investment, Number of Shares Acquired (in shares) 90,000        
Investment Ownership Percentage 5.00%        
Payments to Acquire Other Investments $ 1,900,000        
Equity Securities, FV-NI, Unrealized Loss   207,000 414,000    
Equity Securities, FV-NI, Unrealized Gain       328,000  
Equity Securities, FV-NI, Current   1,300,000 1,500,000    
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]          
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount   0 0 $ 0  
Limited Partnership Interest, Technology Fund [Member] | Other Assets [Member]          
Equity Securities without Readily Determinable Fair Value, Amount         $ 1,000,000
Limited Partnership Interest, Technology Fund [Member] | Other Liabilities [Member]          
Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount   530,000 $ 780,000    
Collateral Pledged [Member]          
Debt Securities, Available-for-Sale, Amortized Cost   147,500,000      
Debt Securities, Available-for-Sale, Restricted   $ 139,600,000