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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Jan. 01, 2021
[2]
Securities available for sale, due within one year, amortized cost $ 43,628    
Securities available for sale, due within one year, fair value 43,323    
Securities available for sale, due after one year but within five years, amortized cost 174,943    
Securities available for sale, due after one year but within five years, fair value 167,932    
Securities available for sale, due after five years but within ten years, amortized cost 4,443    
Securities available for sale, due after five years but within ten years, fair value 4,273    
Securities available for sale, single maturity date, amortized cost 223,014    
Securities available for sale, single maturity date, fair value 215,528    
Total debt securities available for sale, amortized cost 321,403 $ 76,273  
Total debt securities available for sale 299,620 $ 76,292 [1] $ 83,358
Collateralized Mortgage-Backed Securities [Member]      
Agency mortgage-backed securities, amortized cost 98,389    
Agency mortgage-backed securities, fair value $ 84,092    
[1] Derived from audited financial statements
[2] Per our analysis no ACL was necessary for investment securities available for sale.