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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
[2]
Securities available for sale, amortized cost $ 320,123 $ 76,273  
Securities available for sale, unrealized gains 24 711  
Securities available for sale, unrealized losses (19,798) (692)  
Securities available for sale, fair value 300,349 76,292 [1] $ 83,358
US Government Agencies Debt Securities [Member]      
Securities available for sale, amortized cost 1,500 469  
Securities available for sale, unrealized gains 0 0  
Securities available for sale, unrealized losses (15) (3)  
Securities available for sale, fair value 1,485 466  
US Treasury Securities [Member]      
Securities available for sale, amortized cost 161,617    
Securities available for sale, unrealized gains 0    
Securities available for sale, unrealized losses (4,353)    
Securities available for sale, fair value 157,264    
US States and Political Subdivisions Debt Securities [Member]      
Securities available for sale, amortized cost 23,480 28,596  
Securities available for sale, unrealized gains 21 198  
Securities available for sale, unrealized losses (192) 0  
Securities available for sale, fair value 23,309 28,794  
Corporate Debt Securities [Member]      
Securities available for sale, amortized cost 37,046 9,935  
Securities available for sale, unrealized gains 0 0  
Securities available for sale, unrealized losses (2,189) (16)  
Securities available for sale, fair value 34,857 9,919  
Mortgage-backed Agency Securities [Member]      
Securities available for sale, amortized cost 96,480 37,273  
Securities available for sale, unrealized gains 3 513  
Securities available for sale, unrealized losses (13,049) (673)  
Securities available for sale, fair value $ 83,434 $ 37,113  
[1] Derived from audited financial statements
[2] Per our analysis no ACL was necessary for investment securities available for sale.