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Note 2 - INVESTMENT SECURITIES - Activity in Allowance for Credit Losses HTM and AFS securities by major security (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]      
Beginning balance   $ 203  
Balance, ending   203  
Beginning balance   989  
Municipal securities      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 180 202 $ 180
Balance, ending   202 180
Corporate securities      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]      
Beginning balance   989  
Reduction due to sales   (544)  
Provision for credit loss expense $ 989 (445)  
Balance, ending     989
Other securities      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]      
Beginning balance   1  
Balance, ending   1  
Beginning balance   $ 989  
Provision for credit loss expense     989
Balance, ending     $ 989