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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Due in one year or less, Amortized cost $ 78,232  
Due in one year or less, Estimated fair value 76,604  
Due after one year through five years, Amortized cost 403,015  
Due after one year through five years, Estimated fair value 368,300  
Due after five years through ten years, Amortized cost 214,556  
Due after five years through ten years, Estimated fair value 183,416  
Due after ten years, Amortized cost 8,965  
Due after ten years, Estimated fair value 7,072  
Securities, amortized cost 704,768  
Securities, fair value 635,392  
U.S. government mortgage-backed securities, amortized cost 119,999  
U.S. government mortgage-backed securities, fair value 101,552  
Total, amortized cost 824,767 $ 869,996
Securities available-for-sale $ 736,944 $ 786,438