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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Due in one year or less, Amortized cost $ 106,029  
Due in one year or less, Estimated fair value 104,557  
Due after one year through five years, Amortized cost 380,712  
Due after one year through five years, Estimated fair value 364,244  
Due after five years through ten years, Amortized cost 128,989  
Due after five years through ten years, Estimated fair value 118,358  
Due after ten years, Amortized cost 8,100  
Due after ten years, Estimated fair value 7,530  
Securities, amortized cost 623,830  
Securities, fair value 594,689  
U.S. government mortgage-backed securities, amortized cost 104,041  
U.S. government mortgage-backed securities, fair value 93,906  
Total, amortized cost 727,871 $ 798,703
Total, Estimated fair value $ 688,595 $ 736,389