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Note 4 - Investment Securities (Details Textual)
$ in Thousands
Apr. 01, 2022
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-Sale, Allowance for Credit Loss   $ 0  
Debt Securities, Available-for-Sale, Increase to the Carrying Value Resulting From Derivative Instrument That Increased the Unrealized Loss Position   $ 2,300 $ 2,200
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions   417 416
Debt Securities, Available-for-sale, Amortized Cost, Transfer, Amount $ 245,500    
Debt Securities, Available-for-Sale, Amortized Cost, Net of Gain (Loss), Transfer 221,700    
Debt Securities, Available-for-Sale, Transfer to Held to Maturity, Gain (Loss) $ 18,900    
Asset Pledged as Collateral [Member] | Deposits [Member]      
Debt Securities   $ 393,700  
US States and Political Subdivisions Debt Securities [Member]      
Debt Securities, Available-for-Sale, Increase From Derivative Instruments   $ 1,100  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions   235  
US States and Political Subdivisions Debt Securities [Member] | Measurement Input, Loss Severity [Member]      
Debt Securities, Available-for-Sale, Measurement Input   0.1038  
US Government Agencies Debt Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions   46  
US Government Agencies Debt Securities [Member] | Measurement Input, Loss Severity [Member]      
Debt Securities, Available-for-Sale, Measurement Input   0.0731  
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions   136  
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Measurement Input, Loss Severity [Member]      
Debt Securities, Available-for-Sale, Measurement Input   0.1241  
Accrued Interest Receivable [Member]      
Interest Receivable, Investment Securities   $ 2,900 $ 3,400