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Note 7 - Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Due in one year or less, Amortized Cost	$ 564,646
Due in one year or less, Fair Value	564,312
Due after one year through five years, Amortized Cost	182,986
Due after one year through five years, Fair Value	177,692
Due after five years through ten years, Amortized Cost	119,016
Due after five years through ten years, Fair Value	113,945
Due after ten years, Amortized Cost	736,048
Due after ten years, Fair Value	652,407
Total, Amortized Cost	1,602,696	$ 1,726,080
Total, Fair Value	$ 1,508,356	$ 1,604,570

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