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Note 4 - Investment Securities (Details Textual)
$ in Thousands
Apr. 01, 2022
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss   $ 0  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions   435 485
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    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss   $ 0  
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   0.1046  
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions   136  
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Measurement Input, Loss Severity [Member]      
Debt Securities, Available-for-Sale, Measurement Input   0.1372  
US States and Political Subdivisions Debt Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions   253  
US States and Political Subdivisions Debt Securities [Member] | Measurement Input, Loss Severity [Member]      
Debt Securities, Available-for-Sale, Measurement Input   0.1325  
Asset Pledged as Collateral [Member] | Deposits [Member]      
Financial Instruments, Owned, at Fair Value   $ 409,700