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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Jan. 01, 2021
[2]
Securities available for sale, amortized cost $ 321,403 $ 76,273  
Securities available for sale, unrealized gains 10 711  
Securities available for sale, unrealized losses (21,793) (692)  
Securities available for sale, fair value 299,620 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 (12) (3)  
Securities available for sale, fair value 1,488 466  
US Treasury Securities [Member]      
Securities available for sale, amortized cost 160,935    
Securities available for sale, unrealized gains 0    
Securities available for sale, unrealized losses (4,475)    
Securities available for sale, fair value 156,460    
US States and Political Subdivisions Debt Securities [Member]      
Securities available for sale, amortized cost 23,523 28,596  
Securities available for sale, unrealized gains 9 198  
Securities available for sale, unrealized losses (471) 0  
Securities available for sale, fair value 23,061 28,794  
Corporate Debt Securities [Member]      
Securities available for sale, amortized cost 37,056 9,935  
Securities available for sale, unrealized gains 0 0  
Securities available for sale, unrealized losses (2,537) (16)  
Securities available for sale, fair value 34,519 9,919  
Mortgage-backed Agency Securities [Member]      
Securities available for sale, amortized cost 98,389 37,273  
Securities available for sale, unrealized gains 1 513  
Securities available for sale, unrealized losses (14,298) (673)  
Securities available for sale, fair value $ 84,092 $ 37,113  
[1] Derived from audited financial statements
[2] Per our analysis no ACL was necessary for investment securities available for sale.