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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Due in one year or less, Amortized cost $ 101,088  
Due in one year or less, Estimated fair value 99,775  
Due after one year through five years, Amortized cost 374,921  
Due after one year through five years, Estimated fair value 355,282  
Due after five years through ten years, Amortized cost 98,491  
Due after five years through ten years, Estimated fair value 88,747  
Due after ten years, Amortized cost 8,100  
Due after ten years, Estimated fair value 7,372  
Securities, amortized cost 582,600  
Securities, fair value 551,176  
U.S. government mortgage-backed securities, amortized cost 100,340  
U.S. government mortgage-backed securities, fair value 89,240  
Total, amortized cost 682,940 $ 700,528
Total, Estimated fair value $ 640,416 $ 648,513