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Note 7 - Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Due in one year or less, Amortized Cost	$ 581,976
Due in one year or less, Fair Value	581,554
Due after one year through five years, Amortized Cost	157,871
Due after one year through five years, Fair Value	153,934
Due after five years through ten years, Amortized Cost	94,698
Due after five years through ten years, Fair Value	90,171
Due after ten years, Amortized Cost	701,351
Due after ten years, Fair Value	608,381
Total, Amortized Cost	1,535,896	$ 1,668,661
Total, Fair Value	$ 1,434,040	$ 1,547,128

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