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Note 5 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Due in one year or less, Amortized cost $ 92,716  
Due in one year or less, Estimated fair value 91,586  
Due after one year through five years, Amortized cost 370,875  
Due after one year through five years, Estimated fair value 357,222  
Due after five years through ten years, Amortized cost 94,597  
Due after five years through ten years, Estimated fair value 89,267  
Due after ten years, Amortized cost 2,103  
Due after ten years, Estimated fair value 2,103  
Securities, amortized cost 560,291  
Securities, fair value 540,178  
U.S. government mortgage-backed securities, amortized cost 118,927  
U.S. government mortgage-backed securities, fair value 110,482  
Total, amortized cost 679,218 $ 700,528
Total, estimated fair value $ 650,660 $ 648,513