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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Due in one year or less, Amortized cost $ 64,234  
Due in one year or less, Estimated fair value 62,668  
Due after one year through five years, Amortized cost 409,635  
Due after one year through five years, Estimated fair value 378,356  
Due after five years through ten years, Amortized cost 226,621  
Due after five years through ten years, Estimated fair value 200,824  
Due after ten years, Amortized cost 9,174  
Due after ten years, Estimated fair value 7,606  
Securities, amortized cost 709,664  
Securities, fair value 649,454  
U.S. government mortgage-backed securities, amortized cost 124,494  
U.S. government mortgage-backed securities, fair value 109,066  
Total, amortized cost 834,158 $ 869,996
Securities available-for-sale $ 758,520 $ 786,438