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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2021
[1]
Securities available for sale, due within one year, amortized cost $ 157,521    
Securities available for sale, due after one year but within five years, amortized cost 42,976    
Securities available for sale, due after five years but within ten years, amortized cost 0    
Securities available for sale, due after ten years, amortized cost 0    
Securities available for sale, single maturity date, amortized cost 200,497    
Securities available for sale, no single maturity date, amortized cost 94,548    
Securities available for sale, amortized cost 295,045 $ 320,123  
Securities available for sale, due within one year, fair value 156,691    
Securities available for sale, due after one year but within five years, fair value 41,342    
Securities available for sale, due after five years but within ten years, fair value 0    
Securities available for sale, due after ten years, fair value 0    
Securities available for sale, single maturity date, fair value 198,033    
Securities available for sale, no single maturity date, fair value 82,928    
Securities available for sale 280,961 300,349 $ 83,358
US Government Agencies Debt Securities [Member]      
Securities available for sale, due within one year, amortized cost 5,750    
Securities available for sale, due after one year but within five years, amortized cost 0    
Securities available for sale, due after five years but within ten years, amortized cost 0    
Securities available for sale, due after ten years, amortized cost 0    
Securities available for sale, single maturity date, amortized cost 5,750    
Securities available for sale, amortized cost 5,750 1,500  
Securities available for sale, due within one year, fair value 5,749    
Securities available for sale, due after one year but within five years, fair value 0    
Securities available for sale, due after five years but within ten years, fair value 0    
Securities available for sale, due after ten years, fair value 0    
Securities available for sale, single maturity date, fair value 5,749    
Securities available for sale 5,749 1,485  
US Treasury Securities [Member]      
Securities available for sale, due within one year, amortized cost 146,653    
Securities available for sale, due after one year but within five years, amortized cost 0    
Securities available for sale, due after five years but within ten years, amortized cost 0    
Securities available for sale, due after ten years, amortized cost 0    
Securities available for sale, single maturity date, amortized cost 146,653    
Securities available for sale, amortized cost 146,653 161,617  
Securities available for sale, due within one year, fair value 145,826    
Securities available for sale, due after one year but within five years, fair value 0    
Securities available for sale, due after five years but within ten years, fair value 0    
Securities available for sale, due after ten years, fair value 0    
Securities available for sale, single maturity date, fair value 145,826    
Securities available for sale 145,826 157,264  
US States and Political Subdivisions Debt Securities [Member]      
Securities available for sale, due within one year, amortized cost 5,118    
Securities available for sale, due after one year but within five years, amortized cost 14,410    
Securities available for sale, due after five years but within ten years, amortized cost 0    
Securities available for sale, due after ten years, amortized cost 0    
Securities available for sale, single maturity date, amortized cost 19,528    
Securities available for sale, amortized cost 19,528 23,480  
Securities available for sale, due within one year, fair value 5,116    
Securities available for sale, due after one year but within five years, fair value 14,261    
Securities available for sale, due after five years but within ten years, fair value 0    
Securities available for sale, due after ten years, fair value 0    
Securities available for sale, single maturity date, fair value 19,377    
Securities available for sale 19,377 23,309  
Corporate Debt Securities [Member]      
Securities available for sale, due within one year, amortized cost 0    
Securities available for sale, due after one year but within five years, amortized cost 28,566    
Securities available for sale, due after five years but within ten years, amortized cost 0    
Securities available for sale, due after ten years, amortized cost 0    
Securities available for sale, single maturity date, amortized cost 28,566    
Securities available for sale, amortized cost 28,566 37,046  
Securities available for sale, due within one year, fair value 0    
Securities available for sale, due after one year but within five years, fair value 27,081    
Securities available for sale, due after five years but within ten years, fair value 0    
Securities available for sale, due after ten years, fair value 0    
Securities available for sale, single maturity date, fair value 27,081    
Securities available for sale $ 27,081 $ 34,857  
[1] Per our analysis no ACL was necessary for investment securities available for sale.